1. Ask Billboard: Janet Jackson's Biggest Billboard Hits

    May 19, 2015 11:05 AM EDT As always, submit questions about Billboard charts, as well as general music musings, to askbb@billboard.com . Please include your first and last name, as well as your city, state and country, if outside the U.S. Or, Tweet @gthot20 JANET JACKSON'S BIGGEST BILLBOARD HITS Dear Gary,…