The AI music companion your Plex library deserves.
Dig into your stacks.
Type "late night psychedelic soul" and get a playlist. Filter by female artists from the 70s. Discover you've scrobbled Stereolab 247 times but don't own a single album. Runs on your NAS. Your data stays yours.
Everything Plexamp Should Do
Plex has the data. Music Brain surfaces it intelligently.
Natural Language Playlists
Type any mood or vibe. "Quiet and watery." "Those cats are jumpin'." AI expands your prompt into specific genre tags and scores your library against them.
AI Genre Enrichment
Your entire library gets tagged with specific subgenres — shoegaze, dance-punk, balearic, cosmic disco — and written back into Plex. Genre browsing finally makes sense.
Last.fm Integration
111K+ scrobbles drive real play counts, listening patterns, and loved track ratings. Plex's play counts are unreliable. Last.fm's aren't.
Listening Context
"Your Afternoon" — what you actually play 1-5pm. "Weekend Flow." "Often Together" — tracks that appear in the same listening session, cross-artist.
Missing From Your Collection
Artists you've scrobbled 50+ times that aren't in your library. Categorized into Worth Acquiring, Classical, Ambient/Meditation, and Unknown.
Instrumental Detection
AI classifies every track as instrumental or vocal. Filter playlists to instrumentals only, or auto-detect from your prompt.
Smart Filters
Filter by gender, country, era, decade, genre, year range, play count, or rating. "Female artists from Brazil in the 70s" is a valid query.
The Collection
Your library and listening history at a glance. Scrobbles by year, top artists, genre breakdown, library by era and country, gender split.
One-Click Sync
Full sync pipeline in one button: scan Plex for new files → ingest → sync Last.fm → AI tag new tracks. Runs on your NAS, streams live output.
How It Works
Four steps from setup to your first AI-generated playlist.
Install on your NAS
Python app runs alongside Plex. No cloud required. Your music never leaves your network.
Ingest your library
Pulls all tracks from Plex into SQLite. AI tags every track with specific genre and mood tags via OpenAI.
Connect Last.fm
Sync your scrobble history. Real play counts, listening patterns, loved tracks — all imported.
Start digging
Type a mood, set filters, hit Preview. Click Create in Plex — your playlist appears in Plexamp instantly.
The Stacks
A look inside Plex Music Brain.
Natural language playlist generator with filters
The Collection — your library at a glance
Missing From Your Collection — gap analysis
Back Office — one-click sync pipeline
Free & Open Source
Plex Music Brain is free to download and self-host. The only cost is a one-time ~$2 OpenAI charge to tag your library.
What you need
- Synology NAS (or any Linux box running Plex)
- Python 3.12
- Plex Media Server
- OpenAI API key (~$2 one-time)
- Last.fm account + free API key
Free forever. No subscription. Your data stays on your hardware.