Question: Kelly Sheehan wrote songs for which rapper and former backing singer?
Sentence (from "Kelly Sheehan"): She has engineered for Justin Bieber, Mariah Carey, Chris Brown, Katharine McPhee, Tyrese, T.I., The Game, Akon, Ne-Yo, Charlie Wilson, Toni Braxton, Avant, Keri Hilson and others.
Relevant evidence: No