Rob Knox on JT

FORT KNOX: You've probably heard about longtime producer Timbaland's role in the Justin Timberlake smash. But did you know that while the two bonus tracks on the special Target edition of The 20/20 Experience, "Dress On" and "Body Count," feature Timbaland, they were actually co-produced by Justin and his producing partner Rob Knox (T.I., Chris Brown, Britney Spears)? Knox, Timberlake and James Fauntleroy make up producer group The Y's, and their collaboration goes way back to the superstar's 2002 solo debut, Justified. It so happens that the two 20/20 bonus songs (which the Y's co-wrote) were recorded at Larrabee Studios, just a few doors down from our offices; you might even able to detect the faint sounds of editors whining in the background. (3/28a)