Advice on some good music sites?

I'm looking for some good music site where I can find interesting songs and singers. I already know the sites mtv and billboard, but I'm not satisfied. So I was hoping for some hints. I like Shakira, Michael Buble, Skin, Elisa Toffoli, Annie Lennox, Nina Simone, Oasis, REM, The Fray, Whitney Houston, Anastacia, Jennifer Lopez, Pink!, Owl City, Lady Antebellum, Madonna, Cranberries, Bob, Beyonce, Alanis Morissette, Keane, Shania Twain, Dear Emerald, Sugarland, Green Day, Tracy Chapman, Bob Marley, Rihanna and others. thanks for any good advice