I have around 1.5 Gb tabs in guitar pro format, downloaded from russian torrent tracker rutracker.org
If you know a bit of russian(or willing to use translate feature in a browser) then rutracker.org. Yes, it is russian site, but it has a lot of international images for any platforms (including, but not limited to PS3 and Switch). In my experience there are always seeders for everything.
Last.fm Ever since I’ve created an account on last fm 15 years ago almost every song i listen to is scrobbled(last.fm fancy way of saying “put into database for statistics”).
When you listen to enough bands it can actually provide good recommendations