Last.fm collection of C++ libraries by mhx includes algorithms, abstractions, configuration, object oriented shared object loading, template meta programming, and XML parser among other resources that aim to facilitate API interaction. With these libraries, users can access albums, artists, and playlists. Installation instructions available.
Senzari, a cutting-edge music technology company, has launched MusicGraph, a knowledge engine for music that is modeled after a semantic network and powered by an API with an architecture that is similar to Facebook Open Graph Protocol. Senzari has also released a MusicGraph API which allows developers to retrieve objects from the MusicGraph.