The PHP last.fm API enables developers to call Last.fm's API methods from their PHP applications. Responses from the API can be cached on the filesystem or in a database. UTF-8 encoding is done automatically. Scrobbling is not yet supported.
Elsten software, digital music organizer, has announced OneMusicAPI. Proclaimed to be "OneMusicAPI to rule them all," the API acts as a music metadata aggregator that pulls from multiple sources across the web through a single interface. Elsten founder and OneMusicAPI creator, Dan Gravell, found keeping pace with constant changes from individual sources became too tedious a process to adequately organize music.
ShareMyPlaylists, a Spotify playlist sharing site, has just announced the release of the ShareMyPlaylists API, allowing developers access to thousands of playlists, millions of song tracks and a wealth of playlist metadata.