New MusixMatch API Enables Lyric Search Through API
To use the API, you need to register with MusixMatch and receive an API key. The API is REST-based and returns data in three formats: JSON(default), XML or JSONP. Developers can look up methods in the API Wiki.
Although the service is still in testing, and only open to non-commercial use, it provides a service for those developers who are leery of copyright issues that other lyrics services have run into.