Custom backing track. 15 individual channels:
Backing Vocals, Backing Vocals Pharell William, Backing Vocals T.I. (ad lib), Bass, Cowbell, Drum Kit, Eggs, Electric Piano, Hand Clap, Lead Vocal Pharell William, Lead Vocal Robin Thicke (ad lib), Lead Vocal Robin Thicke 1, Lead Vocal Robin Thicke 2, Lead Vocal T.I