I'm posting this because I know there's a bunch of people here who enjoy music and challenges.
I'll post the ones I found so far (or that I think I've found) as a comment.
Apparently, there's some other bands you'll find but that really weren't supposed to be there... which is why some people are claiming to have found over 80 bands... O:-)
I'm also a bit confused with some symbols that seem to represent a singer... but a singer is not a band, is it?
And remember, comments will be spoilers.