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.
The InternetDJ API opens this electronic music site to your app. Since 1997 (not a typo!) composers and fans have been able to share and mix music and videos. According to the API's website, requests are limited to 5,000 a day, responses are in JSON and an auth key is required.