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The Last.fm API gives users the ability to build programs using Last.fm data, whether on the web, the desktop or mobile devices. The RESTful API allows for read and write access to the full slate of last.fm music data resources - albums, artists, playlists, events, users, and more. It allows users to call methods that respond in either XML or JSON.
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This is a Video mashup of Last.fm and Youtube. Play videos of one artist or similar artist.. once after another.. I love it!