Rihanna enters the countdown tonight, but could Katy Perry hold on to #1 for a 15th straight night?

7.  Where Have You Been--Rihanna

6.  She's So Mean--Matchbox Twenty

5.  Want U Back--Cher Lloyd

4.  Everybody Talks--Neon Trees

3.  Good Time--Owl City feat. Carly Rae Jepsen

2.  Some Nights--Fun.

1.  Wide Awake--Katy Perry