What song is this? (Video inside; it works this time)?

http://smg.photobucket.com/albums/v159/A鈥?/a>





The only thing i can hear is ';Down down somethin somethin'; ...it's hiphop/rap/good music to dance to. So that'll help out the genre. It's really bothering me because i can hum the song, just not sing the lyrics....and therefore, since i can't find them on google...i can't download the song.What song is this? (Video inside; it works this time)?
http://www.metrolyrics.com/somethin-some鈥?/a>