I'm still a beginner in android programming and was wondering about music visualizer 2d or 3d doesnt matter. I've search the web but with no luck

I'm trying to do a simple music application and was wondering if anyone has a good tutorial or some other info on how to do an audio visualizer?
It doesnt have to be any fancy stuff... just some kind of visualizer that reacts to music.
Anything that can be helpful, from tutorials to where to start would be really appreciated.

