With the media center support for external lyric files could FileBot support downloading lyric files much like subtitle files.
MusixMatch has an API for search and retrieval of lyrics.
https://developer.musixmatch.com/documentation
I'm not sure if there are other sites that deal with lyric files and I think timestamped (.lrc) files would be great.
Thanks for all your great work!!
EDIT: Found a website that lets you search for available APIs. Below is a link to what lyric APIs they have.
http://www.programmableweb.com/category ... gory=20278