diff --git a/tagger.py b/tagger.py
new file mode 100644
index 0000000..2b7a5fa
--- /dev/null
+++ b/tagger.py
@@ -0,0 +1,219 @@
+#!/usr/bin/env python3
+import re
+from pathlib import Path
+from typing import List
+
+
+def prompt(message: str, default=None, input_type=str):
+    """Prompt user with optional default value."""
+    if default is not None:
+        msg = f"{message} [{default}]: "
+    else:
+        msg = f"{message}: "
+
+    while True:
+        try:
+            value = input(msg).strip()
+            if not value:
+                if default is not None:
+                    return input_type(default)
+                print("This field is required.")
+                continue
+            return input_type(value)
+        except ValueError:
+            print(f"Invalid input. Please enter a valid {input_type.__name__}.")
+
+
+def prompt_bool(message: str, default=True):
+    """Prompt user for yes/no."""
+    default_str = "Y/n" if default else "y/N"
+    while True:
+        value = input(f"{message} [{default_str}]: ").strip().lower()
+        if not value:
+            return default
+        if value in ("y", "yes"):
+            return True
+        if value in ("n", "no"):
+            return False
+        print("Please enter 'y' or 'n'.")
+
+
+def get_config():
+    """Interactively gather configuration."""
+    print("\n" + "=" * 60)
+    print("Audio File Tagger")
+    print("=" * 60 + "\n")
+
+    # Required: folder path
+    while True:
+        outdir = Path(prompt("Enter folder path containing audio files"))
+        if outdir.is_dir():
+            break
+        print(f"Folder not found: {outdir}")
+
+    print("\nOptional settings (press Enter for defaults):\n")
+
+    album = prompt("Album name", default="The Bongo Cat Collection")
+
+    artist = prompt("Artist name", default="Bongo Cat")
+
+    album_artist = prompt("Album artist", default=artist)
+
+    disc = prompt("Disc number", default="2")
+
+    start_track = prompt(
+        "Starting track number", default="15", input_type=int
+    )
+
+    cover_filename = prompt(
+        "Cover filename (relative to folder)",
+        default="cover.png",
+    )
+
+    return {
+        "outdir": outdir,
+        "album": album,
+        "artist": artist,
+        "album_artist": album_artist,
+        "disc": disc,
+        "start_track": start_track,
+        "cover_filename": cover_filename,
+    }
+
+
+def list_audio_files(folder: Path) -> List[Path]:
+    files = list(folder.glob("*.opus")) + list(folder.glob("*.ogg"))
+
+    def sort_key(p: Path):
+        m = re.match(r"^\s*(\d+)", p.stem)
+        return (int(m.group(1)) if m else 10**9, p.name.lower())
+
+    return sorted(files, key=sort_key)
+
+
+def infer_clean_title(p: Path) -> str:
+    name = p.stem
+    name = re.sub(r"^\s*\d+\s*-\s*", "", name, count=1)
+    return name.strip()
+
+
+def tag_one(
+    path: Path,
+    title: str,
+    track_number: int,
+    cover_path: Path,
+    artist: str,
+    album: str,
+    album_artist: str,
+    disc: str,
+):
+    from mutagen.oggopus import OggOpus
+    from mutagen.oggvorbis import OggVorbis
+    from mutagen.flac import Picture
+    import base64
+
+    audio = None
+    try:
+        audio = OggOpus(path)
+    except Exception:
+        audio = OggVorbis(path)
+
+    if audio.tags is None:
+        audio.add_tags()
+
+    audio["TITLE"] = [title]
+    audio["ARTIST"] = [artist]
+    audio["ALBUM"] = [album]
+    audio["ALBUMARTIST"] = [album_artist]
+    audio["DISCNUMBER"] = [disc]
+    audio["TRACKNUMBER"] = [str(track_number)]
+
+    if cover_path.is_file():
+        data = cover_path.read_bytes()
+        pic = Picture()
+        pic.type = 3
+        pic.mime = "image/png"
+        pic.desc = "cover"
+        pic.width = 0
+        pic.height = 0
+        pic.depth = 0
+        pic.colors = 0
+        pic.data = data
+        b64 = base64.b64encode(pic.write()).decode("ascii")
+        audio["METADATA_BLOCK_PICTURE"] = [b64]
+        if "COVERART" in audio:
+            del audio["COVERART"]
+        if "COVERARTMIME" in audio:
+            del audio["COVERARTMIME"]
+
+    audio.save()
+
+
+def main():
+    config = get_config()
+
+    cover_path = config["outdir"] / config["cover_filename"]
+    if not cover_path.exists():
+        print(
+            f"\n⚠ Warning: cover not found at {cover_path}; "
+            "will proceed without cover art.\n"
+        )
+
+    files = list_audio_files(config["outdir"])
+    if not files:
+        print("No .opus or .ogg files found.")
+        return
+
+    # Show summary
+    print("\n" + "=" * 60)
+    print("Configuration Summary:")
+    print("=" * 60)
+    print(f"Folder: {config['outdir']}")
+    print(f"Files to tag: {len(files)}")
+    print(f"Album: {config['album']}")
+    print(f"Artist: {config['artist']}")
+    print(f"Album Artist: {config['album_artist']}")
+    print(f"Disc Number: {config['disc']}")
+    print(f"Starting Track: {config['start_track']}")
+    print(f"Cover file: {cover_path.name} "
+          f"({'found' if cover_path.exists() else 'not found'})")
+    print("=" * 60 + "\n")
+
+    # Show first few files
+    print("Sample files to be tagged:")
+    for f in files[:5]:
+        title = infer_clean_title(f)
+        print(f"  - {f.name} → {title}")
+    if len(files) > 5:
+        print(f"  ... and {len(files) - 5} more")
+    print()
+
+    proceed = prompt_bool("Proceed with tagging?", default=True)
+    if not proceed:
+        print("Cancelled.")
+        exit(0)
+
+    print(f"\nTagging {len(files)} files...\n")
+    for i, f in enumerate(files, start=1):
+        title = infer_clean_title(f)
+        track_no = config["start_track"] + (i - 1)
+        try:
+            tag_one(
+                f,
+                title,
+                track_no,
+                cover_path,
+                config["artist"],
+                config["album"],
+                config["album_artist"],
+                config["disc"],
+            )
+            print(f"[{i}/{len(files)}] ✓ {f.name} (track {track_no})")
+        except Exception as e:
+            print(f"[{i}/{len(files)}] ✗ {f.name} → {e}")
+
+    print("\n✓ Done.")
+
+
+if __name__ == "__main__":
+    main()
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