The Musixmatch Python SDK by Luca De Vitis allows to interact with the API to access catalogs of lyrics, that aim to be useful to implement into music applications. Resources include a quick start guide, installation, documentation, and unit testing.
Echo Nest's API already powers hundreds of music apps (e.g. MTV, Music Hunter, Pocket Hipster, etc.). With new enhancements to its API, Echo Nest looks to expand its reach beyond the music industry by "us[ing] music to drive non-music apps." Echo Nest added "Taste Profile Similarity" and an "affinity prediction" system to its existing platform. With the new features, Echo Nest hopes to connect music listeners to other listeners with similar tastes and predict behavior unrelated to musical preferences.
AudioMicro’s Stock Music and Sound Effects library grants users access to over 300,000 sound files. The library includes a collection of sound effects and complete musical tracks. Spanning every musical genre (Aerobics to World) and fifty Sound Effect categories (Amusement to Whooshes), AudioMicro leader Brian Nimens described AudioMicro as an extensive sound “marketplace.”