Billboard's Twitter 140.

Included on the list:

@claudekelly is a songwriter (Kelly Clarkson, Jessie J). He loves music.

@thedoctorluke is a multiplatinum producer. New tracks. 

@PerezHilton is the power blogger; now searching for "next great boy band." 

@adamleber is Britney Spears' day-to-day manager/resident rumor-squasher.