Lyrics and guitar tab sites were attacked heavily by copyright owners years ago, most went completely down. I'm not even sure why the number of them started slowly creeping back up years ago, other than a a changed focus by the legal arms of record company associations.

The original music copyright wars were over sheet music (or even just chord transcriptions) and player piano rolls, and they haven't ended.

https://en.wikipedia.org/wiki/Fake_book http://www.techdirt.com/articles/20100712/18325210185.shtml