There's been some great new music mashups coming down the pipe lately. We'll highlight some of the better ones below, including a music search engine, local music events, lyrics lookup, a Spotify video playlist app (yes, there's a Spotify API) and a fun "name that tune" game. The most popular music API, the Last.fm API, is featured multiple times, as is the YouTube API, which has become a favorite of music mashups.
Somewhere out there is a singer-songwriter who could use your code. And who knows, that artist--or one of the other more than 10,000 on ArtistData--might even pay you for it.
ArtistData is a site to help musicians store their information and reach out to fans in the shortest amount of time. For example, enter tour dates once, then publish to MySpace, your website and send local media alerts.