Best Song in 2009

I think no one will question about this "song" as the best song in 2009.This is an annual mash up by DJ Earworm where he mixes the top 25 pop songs of 2009 on Billboard into one ultimate pop song:The Black Eyed Peas - BOOM BOOM POWLady Gaga - POKER FACELady Gaga Featuring Colby O'Donis - JUST DANCEThe Black Eyed Peas - I GOTTA FEELINGTaylor Swift - LOVE STORYFlo Rida - RIGHT ROUNDJason Mraz - I'M