The #1 dance song on January 4, 2011

Louder (Put Your Hands Up) By Chris Willis

Other #1 songs on January 4, 2011

#1 Hit Song

Grenade
Bruno Mars

UK #1 Song

When We Collide
Matt Cardle

#1 R&B Song

Can't Be Friends
Trey Songz

#1 Country Song

Felt Good on My Lips
Tim McGraw

#1 Alternative Hit

Waiting for the End
Linkin Park