What's That Music

A desktop app that plays YouTube Music and serves a now-playing overlay for OBS.

The app is a single Electron window that loads music.youtube.com. It also runs a small HTTP/WebSocket server on localhost:9095 that streams the current track to any connected overlay client. Point OBS (or any browser) at http://localhost:9095/ to see the overlay.

Run from source

cd desktop-client
npm install
npm start

The app opens. Sign in to YouTube Music. Play a track. Visit http://localhost:9095/ in another browser to see the overlay.

Build a Windows zip

cd desktop-client
npm run build -- --win zip --x64

Output: desktop-client/dist/WhatsThatMusic-<version>-win.zip. Unzip on a Windows machine and run WhatsThatMusic.exe. The app is unsigned, so SmartScreen will warn on first launch — click "More info → Run anyway."

OBS setup

1. Add a Browser Source.
2. URL: http://localhost:9095/.
3. Width / height: match your scene (the overlay positions itself absolutely; 1920x1080 is fine).
4. Make sure the app is running before OBS loads the source.

Tests

cd desktop-client
npm test

Runs the node:test unit suite (desktop-client/tests/).

Layout

• desktop-client/ — the Electron app (main entry, server module, preload scraper, tray).
• overlay/ — static HTML + JS the bundled server serves at /.
• docs/superpowers/ — design and plan documents.