Before Justin Bieber and Carly Rae Jepsen, when had two Canadians last ruled the Billboard 200 and Hot 100 simultaneously? Plus, updates on ELO and Adele.
Ask Billboard is updated every week. As always, submit your questions about Billboard charts, sales and airplay, as well as general music musings, to email@example.com. Please include your first and last name, as well as your city, state and country, if outside the U.S.