You want to really lose faith in humanity? Spend an hour or two over at BBC Sound Index. Every six hours it lists musical artists according to the number of search queries on a number of popular music related sites, like last.fm, youtube, bebo, google, and a few others.
Over the previous 6 hours, the most popular searches among music artists were
Rihanna, Jonas Brothers, Coldplay, Miley Cyrus, Basshunter, Chris Brown, Eminem, Linkin Park, Jesse McCartney, Katy Perry, The Ting Tings, Madonna, The Verve, Nelly, Duffy, Nickleback, Flo Rida, Slipknot, Kid Rock, and Leona Lewis.
Now there's a mix disc for you.