20.
Lifehouse "Halfway Gone" [Debut]
19.
Jessie James "My Cowboy [=] [2,19]
18.
P!nk "I Don't Believe You" [+2] [2,18]
17.
Adam Lambert "For Your Entertainment" [=] [5,17]
16.
OneRepublic "All the Right Moves" [-5] [8,11]
15.
Leona Lewis "Happy" [-3] [8,4]
14.
Orianthi "According To You" [+1] [4,14]
13.
Taylor Swift "Fifteen" [+3] [4,13]
12.
Bon Jovi "We Weren't Born To Follow" [-2] [8,1]
11.
Flyleaf "Beautiful Bride" [+3] [5,11]
10.
Creed "Rain" [-3] [8,3]
9.
Carrie Underwood "Cowboy Casanova" [+4] [4,9]
8.
Owl City "Fireflies" [=] [8,1]
7.
Kris Allen "Live Like We're Dying" [-4] [8,3]
6.
The Script "Breakeven" [+3] [8,6]
5.
Allison Iraheta "Friday I'll Be Over U" [=] [8,1]
4.
Muse "Undisclosed Desires" [+2] [7,4]
3.
Paramore "Brick by Boring Brick" [-2] [7,1]
2.
Rise Against "Savior" [+2] [6,2]
1.
Michael Buble "Haven't Met You Yet" [+1] [8,1]
Number 1s
Allison Iraheta "Friday I'll Be Over U" (3x)
Bon Jovi "We Weren't Born To Follow"
Owl City "Fireflies"
Paramore "Brick By Boring Brick" (2x)
Michael Bublé “Haven’t Met You Yet”
Sneak Peak at up coming debuts
Florence + The Machine, "The Drumming Song"
Lights "Ice"
Boys Like Girls ft Taylor Swift "Two Is Better Than One"
Nickelback "Never Gonna Be Alone"
Rob Thomas “Someday”
Brandi Carlile “Dreams”
Also thanks to everyone who commented.