1. Ask Billboard: Britney Spears, Rihanna, Hits Of The World

    April 22, 2011 6:35 PM EDT 0 0 0 Ask Billboard is updated every Friday. As always, submit your questions about Billboard charts, sales and airplay, as well as general music musings, to askbb@billboard.com . Please include your first and last name, as well as your city, state and co ...