POTW: Rihanna, Justin Bieber, Katy Perry, Lady Gaga, No Doubt
No Doubt hits the studio with Major Lazer producers Diplo and Switch on July 21. Major Lazer is working on the group's first album of original material since a decade.

The latest reader mailbag looks at Olympic theme songs, Maroon 5, Carly Rae Jepsen, No Doubt and Washington, D.C.'s best musicians.

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 country, if outside the U.S.

NEW ACTS' REIGN WON'T FALL

Dear Gary,

What a great spring and summer it's been for new talent! With the last three consecutive No. 1 Hot 100 hits by