Slinky is a Three.js webapp which visualises music from SoundCloud. A node server proxys an audio stream from Soundcloud to the webapp.
This project uses an express server with Dancer.js for audio analysis and Three.js to render with WebGL.
Pasting in any SoundCloud track url will rebuild the visualiser. Note, it must be a URL to a track rather than a playlist, and Safari 6 does does not currently support processing audio from a media element source.