Inspired by monkeymook and sidslimed on 8bc, I've compiled an archive a GB sound/music software. The archive is arranged as a directory listing, and every directory can have a readme file and a couple of screen shots. The goal is to add that to as many programs as possible, but I just launched the site, so...
http://gbdev.gg8.se/files/musictools/
If your favorite program is missing or there's some weird bug, please tell me about it.