This past spring, when Australian songstress Sia Furl­er told her manager Jonathan Daniel about AJR, a trio of brothers whose undeniably catchy pop song "I'm Ready" caught her ear, he knew exactly who to call: Steve Greenberg, a producer/songwriter, former president of Columbia Records and current head of S-Curve Records, who'd previously worked with two other brother trios, Hanson and the Jonas Brothers.

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