The #1 alternative song on January 21, 2009

Sex on Fire By Kings of Leon

Other #1 songs on January 21, 2009

#1 Hit Song

Just Dance
Lady Gaga featuring Colby O'Donis

UK #1 Song

Just Dance
Lady Gaga featuring Colby O'Donis

#1 R&B Song

Single Ladies (Put a Ring on It)
Beyoncé

#1 Country Song

Start a Band
Brad Paisley duet with Keith Urban

#1 Dance Track

Human
The Killers

Notable January 21 birthdays in the 2000s

IShowSpeed

Born January 21, 2005