I am not sure how they determine ‘mainstream-ness’ but assuming it’s among those who use that site, and that the people using such sites are the type that are proud of their being hipster… Heh. I guess I should just own up to it: both being a hipster and being proud of it, lol!
At the risk of exposing my bad musical taste, here’s the top 50 songs from my lastfm account:
Tsunami45chan