ProgrammableWeb lists many popular Music APIs in the directory including Last.fm, 7digital and Spotify Metadata. This post features a few really creative, entertaining mashups that use a few popular Music APIs.
There's a lot of fuss over the RIAA and the Internet. It seems like it's been a never-ending battle to make music play nice with the internet. Sure, we've got services like Rdio and Grooveshark, but what about making data open to make our listening experience better and more connected with everything else we do?