Madonna, Bieber, Gaga - Guy Oseary, Scooter Braun and Troy Carter have helped manage the careers of three of music's biggest acts. Now they've set their sights on finding the rock stars of tech.

Guy Oseary is sitting in the sprawling yard of his Beverly Hills estate, listing all the things he's said "no" to in the past 16 years. It is not a short list.

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