diff --git a/SNDC/__init__.py b/SNDC/__init__.py
new file mode 100644
index 0000000..8bf2ec5
--- /dev/null
+++ b/SNDC/__init__.py
@@ -0,0 +1,451 @@
+from __future__ import annotations
+import re
+from http.cookiejar import CookieJar
+from typing import Any, Optional
+from urllib.parse import urlparse
+import click
+from unshackle.core.config import config
+from unshackle.core.credential import Credential
+from unshackle.core.music import MusicTrackOption
+from unshackle.core.service import Service
+from unshackle.core.titles import Music, Song, Titles_T
+from unshackle.core.tracks import Audio, Chapters, Tracks
+from unshackle.core.tracks.track import Track
+
+_INVISIBLE = re.compile(r"[​-‏‪-‮⁠]")
+
+
+class SNDC(Service):
+    """
+    Service code for SoundCloud (https://soundcloud.com).
+
+    www.nostalgic.cc
+    Authorization: Cookies, Credentials
+    Security: None
+    """
+
+    ALIASES = ("SNDC", "soundcloud", "sc")
+    GROUP_AUDIO_DOWNLOADS = True
+
+    TITLE_RE = r"^(?:https?://)?(?:www\.|m\.)?soundcloud\.com/[^\s?#]+"
+    _PRESET_BITRATE = {
+        "aac_hq": 256000, "aac_256k": 256000, "aac_160k": 160000, "aac_96k": 96000,
+        "aac_1_0": 128000, "mp3_1_0": 128000, "mp3_0_0": 128000, "mp3_0_1": 64000,
+        "opus_0_0": 72000,
+    }
+
+    @staticmethod
+    @click.command(name="SNDC", short_help="https://soundcloud.com", help=__doc__)
+    @click.argument("title", type=str)
+    @click.option("-q", "--quality", "quality",
+                  type=click.Choice(["original", "aac", "mp3"], case_sensitive=False),
+                  default=None,
+                  help="original = Uploader's file if downloadable else AAC; "
+                       "aac = Best AAC stream (256k on Go+) or mp3 = 128k MP3. Default: original.")
+    @click.pass_context
+    def cli(ctx, **kwargs):
+        return SNDC(ctx, **kwargs)
+
+    def __init__(self, ctx, title: str, quality: Optional[str]):
+        super().__init__(ctx)
+        self.title = title
+        self.quality_pref = (quality or self.config.get("default_quality", "original")).lower()
+        self.client_id: Optional[str] = None
+        self.oauth_token: Optional[str] = None
+
+    def authenticate(self, cookies: Optional[CookieJar] = None, credential: Optional[Credential] = None) -> None:
+        super().authenticate(cookies, credential)
+        self.session.headers.update({
+            "User-Agent": self.config["user_agent"],
+            "Origin": self.config["web_url"],
+            "Referer": self.config["web_url"] + "/",
+        })
+        self.client_id = self._extract_client_id() or (str(self.config.get("client_id") or "").strip() or None)
+        if not self.client_id:
+            self.log.error(" - Could not get a SoundCloud client_id."); raise SystemExit(1)
+        token = None
+        if credential:
+            user = (credential.username or "").strip()
+            pw = (credential.password or "").strip()
+            if user.lower() in ("token", "oauth", "oauth_token") and pw:
+                token = pw
+            elif pw and not user:
+                token = pw
+        if not token and cookies:
+            for cookie in cookies:
+                if cookie.name == "oauth_token":
+                    token = cookie.value
+                    break
+
+        if token:
+            self.oauth_token = token if token.lower().startswith("oauth ") else token
+            self.session.headers["Authorization"] = f"OAuth {token}"
+            self.log.info(" + Authenticated with SoundCloud (OAuth)")
+        else:
+            self.log.warning(" - No oauth_token found; Fallback to mp3 128kb/s.")
+
+    def _extract_client_id(self) -> Optional[str]:
+        try:
+            page = self.session.get(self.config["web_url"] + "/").text
+            scripts = re.findall(r'<script[^>]+src="(https://[^"]+\.js)"', page)
+            for src in reversed(scripts):
+                try:
+                    js = self.session.get(src).text
+                except Exception:
+                    continue
+                m = re.search(r'client_id\s*[:=]\s*"([a-zA-Z0-9]{20,})"', js)
+                if m:
+                    self.log.debug(f" + Extracted client_id from {src}")
+                    return m.group(1)
+        except Exception as e:
+            self.log.debug(f"client_id extraction failed: {e}")
+        return None
+
+    def _api(self, endpoint: str, params: Optional[dict] = None, allow_error: bool = False) -> Optional[Any]:
+        url = endpoint if endpoint.startswith("http") else f"{self.config['base_url']}/{endpoint.lstrip('/')}"
+        p = {"client_id": self.client_id}
+        if params:
+            p.update(params)
+        resp = self.session.get(url, params=p)
+        if resp.status_code != 200:
+            if allow_error:
+                return None
+            self.log.error(f" - SoundCloud API error on {endpoint}: {resp.status_code} {resp.text[:200]}")
+            raise SystemExit(1)
+        return resp.json()
+
+    def get_titles(self) -> Titles_T:
+        obj = self._api("resolve", params={"url": self.title})
+        kind = obj.get("kind")
+
+        if kind == "track":
+            song = self._build_song(obj, total_tracks=1)
+            return Music([song], kind="single",
+                         title=song.album, artist=song.artist, year=song.year,
+                         total_tracks=1, artwork_url=song.artwork_url)
+
+        if kind == "playlist":
+            return self._build_playlist(obj)
+
+        self.log.error(f" - Unsupported SoundCloud URL: {kind!r} (Need a track or playlist/album URL).")
+        raise SystemExit(1)
+
+    def _build_playlist(self, playlist: dict) -> Music:
+        items = playlist.get("tracks", [])
+        full: dict[int, dict] = {}
+        need_ids = [t["id"] for t in items if isinstance(t, dict) and "media" not in t and t.get("id")]
+        for t in items:
+            if isinstance(t, dict) and t.get("media"):
+                full[t["id"]] = t
+        for i in range(0, len(need_ids), 50):
+            batch = need_ids[i:i + 50]
+            fetched = self._api("tracks", params={"ids": ",".join(map(str, batch))}, allow_error=True) or []
+            for ft in fetched:
+                if ft.get("id"):
+                    full[ft["id"]] = ft
+
+        album_title = self._clean(playlist.get("title")) or "Unknown Album"
+        is_album = bool(playlist.get("is_album"))
+        total = playlist.get("track_count") or len([t for t in items if full.get(t.get("id") if isinstance(t, dict) else t)])
+        songs = []
+        position = 0
+        for entry in items:
+            tid = entry.get("id") if isinstance(entry, dict) else entry
+            track = full.get(tid)
+            if not track:
+                continue
+            position += 1
+            songs.append(self._build_song(track, album_ctx=album_title, position=position, total_tracks=total))
+
+        if not songs:
+            self.log.error(" - No playable tracks found in playlist."); raise SystemExit(1)
+
+        return Music(
+            songs,
+            kind="album" if is_album else "playlist",
+            title=album_title,
+            artist=self._clean((playlist.get("user") or {}).get("username")),
+            year=self._year(playlist),
+            total_tracks=len(songs),
+            artwork_url=self._cover(playlist.get("artwork_url") or songs[0].artwork_url),
+        )
+
+    def _build_song(self, track: dict, album_ctx: Optional[str] = None, position: Optional[int] = None,
+                    total_tracks: Optional[int] = None) -> Song:
+        pm = track.get("publisher_metadata") or {}
+        user = track.get("user") or {}
+        title = self._clean(track.get("title")) or "Unknown"
+        artist = self._clean(pm.get("artist")) or self._clean(user.get("username")) or "Unknown Artist"
+        album = self._clean(album_ctx) or self._clean(pm.get("album_title")) or title
+        year = self._year(track) or 1
+        artwork = self._cover(track.get("artwork_url") or user.get("avatar_url"))
+        genre = self._clean(track.get("genre")) or None
+        isrc = pm.get("isrc") or None
+        label = self._clean(track.get("label_name")) or None
+        release_date = self._release_date(track)
+
+        data = {
+            "service": self.ALIASES[0],
+            "source": self.ALIASES[0],
+            "track_id": str(track.get("id")),
+            "track_url": track.get("permalink_url"),
+            "title": title,
+            "artist": artist,
+            "performer": artist,
+            "album": album,
+            "album_artist": artist,
+            "track_number": position or 1,
+            "total_tracks": total_tracks,
+            "disc_number": 1,
+            "genre": genre,
+            "isrc": isrc,
+            "label": label,
+            "release_date": release_date,
+            "year": year,
+            "copyright": self._clean(pm.get("c_line")) or None,
+            "artwork_url": artwork,
+            "duration": round((track.get("duration") or 0) / 1000) or None,
+            "channels": 2,
+            "downloadable": bool(track.get("downloadable")),
+            "has_downloads_left": bool(track.get("has_downloads_left")),
+            "original_format": track.get("original_format"),
+            "track_authorization": track.get("track_authorization"),
+            "transcodings": (track.get("media") or {}).get("transcodings", []),
+        }
+        if config.tag:
+            data["comment"] = config.tag
+        data["quality"] = self._quality_label(data)
+
+        return Song(
+            id_=str(track.get("id")),
+            service=self.__class__,
+            name=title,
+            artist=artist,
+            album=album,
+            track=int(position or 1),
+            disc=1,
+            year=int(year),
+            album_artist=artist,
+            release_type="single" if not album_ctx else "album",
+            total_tracks=total_tracks if total_tracks else None,
+            genre=genre,
+            isrc=isrc if isinstance(isrc, str) else None,
+            label=label,
+            artwork_url=artwork,
+            data=data,
+        )
+
+    def get_music_track_options(self, song: Song) -> list[MusicTrackOption]:
+        data = song.data if isinstance(song.data, dict) else {}
+        use_original = self._will_use_original(data)
+        if use_original:
+            fmt = (data.get("original_format") or "flac").lower()
+            codec = {"flac": "FLAC", "wav": "WAV", "aiff": "AIFF", "aif": "AIFF", "mp3": "MP3", "m4a": "AAC"}.get(fmt, fmt.upper())
+            return [MusicTrackOption(codec=codec, channels=2.0, lossless=codec in ("FLAC", "WAV", "AIFF"),
+                                     duration=data.get("duration"), quality_label=self._quality_label(data))]
+        transcoding = self._best_stream_transcoding(data)
+        codec = "MP3" if transcoding and self._tc_codec(transcoding) == "mp3" else "AAC"
+        bitrate = self._tc_bitrate(transcoding) if transcoding else None
+        return [MusicTrackOption(codec=codec, bitrate=bitrate, channels=2.0,
+                                 lossless=False, duration=data.get("duration"),
+                                 quality_label=self._quality_label(data))]
+
+    def get_tracks(self, title: Song) -> Tracks:
+        data = title.data if isinstance(title.data, dict) else {}
+        track_id = str(title.id)
+
+        if self._will_use_original(data):
+            url, ext = self._original_download(track_id, data)
+            if url:
+                codec = Audio.Codec.FLAC if ext == "flac" else None
+                audio = Audio(
+                    url, language=title.language or "en", codec=codec, channels=2,
+                    descriptor=Track.Descriptor.URL, id_=track_id, data={"ext": ext},
+                )
+                return Tracks([audio])
+            self.log.warning(" - Original download unavailable; falling back to stream.")
+
+        transcoding = self._best_stream_transcoding(data)
+        if not transcoding:
+            self.log.error(f" - No usable stream for track {track_id}."); raise SystemExit(1)
+        stream_url = self._resolve_stream(transcoding, data.get("track_authorization"))
+        is_mp3 = self._tc_codec(transcoding) == "mp3"
+        is_progressive = self._tc_progressive(transcoding)
+        self.log.debug(
+            f" + Stream: preset={transcoding.get('preset')} quality={transcoding.get('quality')} "
+            f"protocol={'progressive' if is_progressive else 'hls'}"
+        )
+        audio = Audio(
+            stream_url, language=title.language or "en",
+            codec=None if is_mp3 else Audio.Codec.AAC,
+            bitrate=self._tc_bitrate(transcoding), channels=2,
+            descriptor=Track.Descriptor.URL if is_progressive else Track.Descriptor.HLS,
+            id_=track_id,
+            data={"ext": "mp3" if is_mp3 else "m4a"},
+        )
+        return Tracks([audio])
+
+    def get_chapters(self, title: Song) -> Chapters:
+        return Chapters()
+
+    def _will_use_original(self, data: dict) -> bool:
+        return (self.quality_pref == "original"
+                and bool(data.get("downloadable")) and bool(data.get("has_downloads_left")))
+
+    def _stream_transcodings(self, data: dict) -> list[dict]:
+        out = []
+        for t in (data.get("transcodings") or []):
+            if not isinstance(t, dict) or not t.get("url") or not t.get("preset"):
+                continue
+            if str(t.get("preset")).lower().startswith("abr_"):
+                continue
+            out.append(t)
+        return out
+
+    @staticmethod
+    def _tc_codec(t: dict) -> str:
+        preset = str(t.get("preset") or "").lower()
+        mime = str((t.get("format") or {}).get("mime_type") or "").lower()
+        if "aac" in preset or "mp4a" in mime:
+            return "aac"
+        if "opus" in preset or "opus" in mime:
+            return "opus"
+        if "mp3" in preset or "mpeg" in mime:
+            return "mp3"
+        return "other"
+
+    @staticmethod
+    def _tc_progressive(t: dict) -> bool:
+        return str((t.get("format") or {}).get("protocol") or "").lower() == "progressive"
+
+    def _tc_bitrate(self, t: dict) -> int:
+        preset = str(t.get("preset") or "").lower()
+        m = re.search(r"(\d+)k", preset)
+        if m:
+            return int(m.group(1)) * 1000
+        if preset in self._PRESET_BITRATE:
+            return self._PRESET_BITRATE[preset]
+        quality = str(t.get("quality") or "").lower()
+        codec = self._tc_codec(t)
+        if codec == "aac":
+            return 256000 if quality == "hq" else 128000
+        if codec == "mp3":
+            return 128000
+        if codec == "opus":
+            return 72000
+        return 128000 if quality == "hq" else 96000
+
+    def _best_stream_transcoding(self, data: dict) -> Optional[dict]:
+        candidates = self._stream_transcodings(data)
+        if not candidates:
+            return None
+        prefer_mp3 = self.quality_pref == "mp3"
+
+        def codec_pref(t: dict) -> int:
+            codec = self._tc_codec(t)
+            if prefer_mp3:
+                return {"mp3": 3, "aac": 2, "opus": 1}.get(codec, 0)
+            return {"aac": 3, "opus": 2, "mp3": 1}.get(codec, 0)
+
+        def rank(t: dict) -> tuple:
+            quality = str(t.get("quality") or "").lower()
+            return (
+                0 if t.get("snipped") else 1,
+                codec_pref(t),
+                1 if quality == "hq" else 0,
+                1 if self._tc_progressive(t) else 0,
+                0 if t.get("is_legacy_transcoding") else 1,
+                self._tc_bitrate(t),
+            )
+
+        return max(candidates, key=rank)
+
+    def _resolve_stream(self, transcoding: dict, track_authorization: Optional[str]) -> str:
+        params = {}
+        if track_authorization:
+            params["track_authorization"] = track_authorization
+        res = self._api(transcoding["url"], params=params)
+        url = res.get("url")
+        if not url:
+            self.log.error(f" - No stream URL returned: {res}"); raise SystemExit(1)
+        return url
+
+    def _original_download(self, track_id: str, data: dict) -> tuple[Optional[str], str]:
+        res = self._api(f"tracks/{track_id}/download",
+                        params={"app_version": self.config.get("app_version"), "app_locale": "en"},
+                        allow_error=True)
+        redirect = (res or {}).get("redirectUri")
+        if not redirect:
+            return None, "flac"
+        ext = (data.get("original_format") or "").lower().replace("aif", "aiff")
+        if not ext:
+            try:
+                head = self.session.head(redirect, allow_redirects=True, timeout=15)
+                cd = head.headers.get("Content-Disposition", "")
+                m = re.search(r'filename="?[^"]+\.([A-Za-z0-9]+)"?', cd)
+                if m:
+                    ext = m.group(1).lower()
+            except Exception:
+                pass
+        return redirect, (ext or "flac")
+
+    def on_track_downloaded(self, track: Any) -> None:
+        try:
+            path = getattr(track, "path", None)
+            tdata = getattr(track, "data", None)
+            if not path or not path.exists() or not isinstance(tdata, dict):
+                return
+            ext = tdata.get("ext")
+            if not ext or path.suffix.lower() == f".{ext}":
+                return
+            new_path = path.with_suffix(f".{ext}")
+            if new_path.exists():
+                new_path.unlink()
+            path.rename(new_path)
+            track.path = new_path
+        except Exception as e:
+            self.log.debug(f"Extension rename skipped: {e}")
+
+    @staticmethod
+    def _clean(value: Any) -> str:
+        if not value:
+            return ""
+        return _INVISIBLE.sub("", str(value)).strip()
+
+    @staticmethod
+    def _year(obj: dict) -> int:
+        for key in ("release_date", "display_date", "created_at"):
+            value = obj.get(key)
+            if value:
+                m = re.match(r"(\d{4})", str(value))
+                if m and int(m.group(1)) > 0:
+                    return int(m.group(1))
+        return 0
+
+    @staticmethod
+    def _release_date(obj: dict) -> Optional[str]:
+        for key in ("release_date", "display_date", "created_at"):
+            value = obj.get(key)
+            if value and re.match(r"\d{4}-\d{2}-\d{2}", str(value)):
+                return str(value)[:10]
+        return None
+
+    @staticmethod
+    def _cover(url: Optional[str]) -> Optional[str]:
+        if not url:
+            return None
+        return re.sub(r"-(large|t\d+x\d+|small|badge|tiny|mini|original)\.(jpg|png)", r"-original.\2", url)
+
+    def _quality_label(self, data: dict) -> str:
+        if self._will_use_original(data):
+            return f"Original {(data.get('original_format') or 'FLAC').upper()}"
+        transcoding = self._best_stream_transcoding(data)
+        if not transcoding:
+            return ""
+        codec = self._tc_codec(transcoding)
+        kbps = self._tc_bitrate(transcoding) // 1000
+        if codec == "mp3":
+            return f"MP3 {kbps} kb/s"
+        if codec == "opus":
+            return f"Opus {kbps} kb/s"
+        return f"AAC {kbps} kb/s"
\ No newline at end of file
diff --git a/SNDC/config.yaml b/SNDC/config.yaml
new file mode 100644
index 0000000..03c0751
--- /dev/null
+++ b/SNDC/config.yaml
@@ -0,0 +1,10 @@
+user_agent: 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/125.0.0.0 Safari/537.36'
+
+base_url: 'https://api-v2.soundcloud.com'
+web_url: 'https://soundcloud.com'
+
+client_id: 'lmRjTI0FqeXygHMXc3hRzS7hth20PNk5'
+
+app_version: '1783608776'
+# original (best), aac (aac_256 Go+), mp3 (mp3_1_0 128kb/s)
+default_quality: 'original'
\ No newline at end of file