• Music, music app, tomato, tomahto? Seems so, lately. Artists from Metallica to Mariah Carey have created apps, offering insider information or employing voice-recognition software to rate users' singing ability (Mariah Carey-oke, anyone?). I Am T-Pain, a top-selling $2.99 download that allows users to mimic the singer's voice through Auto-Tune, has been purchased 1.8 million times by fans and nonfans alike, something that will have this San Francisco conference buzzing. "That's the value of this platform," says Antony Bruno, Billboard's executive director of digital content.

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