Providers have no idea how many songs are going to be streamed, making it difficult to determine the revenue that must be generated to turn a profit (Pandora, for example, loses more than half of its revenue to streaming royalties).

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The songs, which have no names, build from the characters' interactions and feelings.

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"Definitely, I like Nirvana a lot and there are no songs that I don't like -- they all have a special place for people, " Elden said.

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We listened to The Cure and some retro songs for a half-second (Europeans have a thing for The Beach Boys, no?), then headed downstairs to hear more European vibes.

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