Internet pop-up ads tend to be terribly annoying, but not for Big Boi. In fact, the Outkast rapper-producer, 40, has one to thank for his relationship with upstate New York indie-pop duo Phantogram, whose tune "Mouthful of Diamonds" began playing randomly while he was surfing the web, prompting him to Shazam the song. Impressed, he connected with band members Sarah Barthel, 32, and Josh Carter, 33, at San Francisco's Outside Lands festival in 2011, and then recorded three songs with them on his last LP, 2012's Vicious Lies and Dangerous Rumors.

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