Music Streaming Wars: Top 8 Contenders

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Background: The New York City-based start-up has received its share of press, but has struggled to scale in a meaningful way.

Specs: Songza's free "Music Concierge" service recommends playlists by mood, which is a potential differentiator in a crowded market.

Is it working? Not yet. The company raised a $1.5 million convertible note from some notable investors late last year, and 2 million new users joined last summer. But it still hasn't said how it plans to monetize nor has it figured out a way to add users. The Associated Press reports Songza racked up 2 million listeners in May last year versus 1.2 billion on Pandora's website.