what's this song

[christimothy]

i know one part of the lyrics ,the lyrics are it says to the left to the left to the right to the right i know its a older r & b or rap song but i dont know the song or who its sung by

[Mortartube]

Beyonce - Irreplaceable

[maimai]

Not the Stereo MCs Step it Up - prob wrong genre?
http://www.uppercutmusic.com/artist_m/mcs_ster eo_lyrics/step_it_up_lyrics.html

[sadge80]

beyonce irreplacable