A look at Spears' top-selling digital and physical singles, plus quirky chart feats, courtesy of knowledgeable 'Ask Billboard' readers.
Ask Billboard is updated every week. As always, submit your questions about Billboard charts, sales and airplay, as well as general music musings, to firstname.lastname@example.org. Please include your first and last name, as well as your city, state and country, if outside the U.S.
WHAT ARE BRITNEY SPEARS' BEST-SELLING SINGLES?
After you ran down her album sales in "Ask Billboard" last week, can we please get the sales, physical and digital, of