Weekly Music News: Def Jam's decision to keep the world in the dark regarding singer Rihanna's single "Russian Roulette" may have back fired; an explanation about this in a minute.

Columbia Records has signed tween TV sensation & iCarly Star Miranda Cosgrove, star of Nickelodeon's convergent mega-hit iCarly to be a recording artist, as part of the global partnership between Nick and the Sony Music Label Group.