Game Theme Song

Plays each game's theme music in the background when you open its page in your Steam library - with smooth fades, a local cache, your own custom tracks and zero clicks.

Features

Auto-Play - open a game page and its theme starts playing, no clicks needed	Smooth Fades - gentle fade-in/out and cross-fades when you jump between games
Search Indicator - animated "Searching music…" toast while a theme is being found	Local Cache - themes download once, repeat visits start instantly
Custom Music - set your own audio track per game; your pick always overrides the auto-theme	Music Library - searchable window listing your games to assign and manage custom tracks
Volume Slider - 0–100% with 1% precision, applied live while music plays	Welcome Tour - friendly one-time intro window after install

How It Works

1. You open a game page - the plugin detects the app and resolves the game's name
2. The backend searches the game's official soundtrack and picks the main theme track
3. The track is downloaded once and cached locally for instant replays
4. Music fades in - switch games and it cross-fades, leave the page and it fades out

Set a custom track for any game and it always plays instead of the auto-fetched theme.

Installation

Requires Millennium to be installed first.

1. Open the Steam Menu
2. Go to Millennium
3. Choose Install the plugin
4. Insert the plugin ID
5. Restart Steam - done!

Configuration

Steam Menu → Millennium Library Manager → Game Theme Song

Custom Game Music - pick your own theme for any game; it plays before the auto search (opens the Music Library)

Music Volume - background theme volume, 0% to 100% in 1% steps, applied instantly

Song Length Limit - cap how long a theme plays; Off plays the full song

Loop Song - the theme repeats while you stay on the game page

Stop on Game Launch - theme music stops when you launch a game

Clear Downloaded Music - shows cached track count and size; clears the local cache to free disk space

Custom Music

Prefer your own track for a game? Open the plugin settings and use the Music Library:

1. Open Steam Menu → Millennium → Game Theme Song and click Music Library
2. Search for the game you want
3. Pick an audio file from your PC - it's saved and used instantly
4. Your custom track always overrides the auto-theme; clear it anytime to fall back

Supported formats: MP3, M4A, AAC, OGG, OPUS, WAV, FLAC - up to 50 MB per file.

FAQ

Where does the music come from? From the game's official soundtrack - the plugin looks it up automatically and picks the main theme.

Can I use my own music? Yes - open Music Library in the plugin settings, search for a game and choose any audio file (MP3, M4A, AAC, OGG, OPUS, WAV, FLAC, up to 50 MB). Your track is saved locally and always takes priority over the auto-theme.

Does it play over my games? No. Music only plays while you're browsing a game's page in the library and fades out when you leave it.

What if a game has no official soundtrack online? The plugin picks the closest matching soundtrack it can find, so you still get fitting theme music for almost every game - or set your own custom track for a perfect match.

Does it slow down Steam? No - themes are cached after the first visit and playback is just a background audio element.

License

MIT - see LICENSE. Not affiliated with Valve or Steam.

_{Made for Millennium with 💕}