19th countdown
20.
Muse “Resistance” [Debut]
19.
Motion City Soundtrack “Her Words Destroyed My Planet” [Debut]
18.
Alicia Keys “Try Sleeping With A Broken Heart” [+2] [2,18]
17.
Lady Gaga ft Beyonce "Telephone" [+2] [3,17]
16.
Nickelback "Never Gonna Be Alone" [-3] [10,5]
15.
Reba McEntire "Consider Me Gone" [-1] [4,14]
14.
A Fine Frenzy “Happier” [+2] [2,14]
13.
Evanescence “Together Again” [+5] [2,13]
12.
Civil Twilight "Letters From the Sky" [+5] [3,12]
11.
Nelly Furtado "Mas" [+1] [4,11]
10.
Lifehouse "Halfway Gone" [-3] [13,1]
9.
Lights "Ice" [=] [12,1]
8.
Rihanna "Rude Boy" [+3] [4,8]
7.
Brandi Carlile “Dreams” [-2] [8,5]
6.
Boys Like Girls ft Taylor Swift "Two Is Better Than One" [-3] [11,2]
5.
Train “Hey, Soul Sister” [+3] [6,5]
4.
Leona Lewis “I See You” [+2] [6,4]
3.
Rob Thomas “Someday” [-2] [10,1]
2.
Verdera “Satisfy” [+2] [7,2]
1.
Angel Taylor “Just Like You” [+1] [7,1]
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”
Rise Against "Savior" (3x)
Muse “Undisclosed Desires”
Flyleaf “Beautiful Bride”
Orianthi “According To You”
Lights “Ice” (2x)
Lifehouse “Halfway Gone”
Rob Thomas “Someday” (2x)
Angel Taylor “Like You Do”
Retired
Muse “Undisclosed Desires” February 28, 2010 @ #9
Rise Against “Savior” March 7th, 2010 @ #20
Flyleaf “Beautiful Bride” March 14th, 2010 @ #19
Orianthi “According To You” March 21st, 2010 @ #10
Sneak Peak at up coming debuts
Lady Antebellum “Need You Know”
Bon Jovi "Superman Tonight"
P!nk "Glitter in the Air"
Melissa Etheridge "Fearless Love"
V.V. Brown "Shark in the Water"
Pixie Lott "Gravity"
Also thanks to everyone who commented.
BLG ¦ Leona Lewis ¦ Train ¦ Orianthi ¦ Rihanna ¦ 30 Seconds To Mars ¦ Evanescence 
¦ Lady GaGa feat Beyonce 
¦ Alicia Keys
Leona Lewis / Train / Rihanna / Evanescence