PSY's 'Gangnam Style' joins the list of memorable No. 2 Hot 100 hits; fun.'s 'Some Nights' does the same for No. 3-peaking songs; Demi Lovato's sales; and more soundtrack stopgap hits.
As always, submit your questions about Billboard charts, sales and airplay, as well as general music musings, to [email protected]. Please include your first and last name, as well as your city, state and country, if outside the U.S. Or, Tweet questions to Gary Trust: