In Internet radio, Pandora dominates, Apple looms and Songza continues to grow and roll out innovative features. Songza has surpassed 6 million app installations and attracted 4.7 million active users in March alone, up from 2 million active monthly users at the end of last summer. Although the service is far behind Pandora's 70 million active users, it has proved to be a formidable competitor.

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