This library in Java language for the Spotify Echo Nest API provides access to the Track Analysis API. With this resource, developers can obtain track's loudness, mode, key, tempo, signature, detailed beat structure, harmonic content, and timbre information. See examples with hottest songs, static playlists, and similar artists at https://github.com/echonest/jEN/tree/master/src/com/echonest/api/v4/examples
For music enthusiasts who thrive on insider knowledge and detailed music conversation, WhoSampled would be just their cup of tea. It's basically an online community for discovering and discussing sampled music, remixes and cover songs. WhoSampled has partnered with The Echo Nest to provide the WhoSampled API that allows developers to access and integrate its functionality with other applications.
Facebook has launched a new Continuous Live Video API that enables developers to broadcast long and persistent streaming video to the world's largest social network. Previously, Facebook Live streams were limited to 90 minutes, but thanks to the new API, third parties can broadcast longer events.