The #1 R&B song on January 19, 2009

Single Ladies (Put a Ring on It) By Beyoncé

Other #1 songs on January 19, 2009

#1 Hit Song

Just Dance
Lady Gaga featuring Colby O'Donis

UK #1 Song

Just Dance
Lady Gaga featuring Colby O'Donis

#1 Country Song

Start a Band
Brad Paisley duet with Keith Urban

#1 Alternative Hit

Sex on Fire
Kings of Leon

#1 Dance Track

Human
The Killers