What music fans really want.

Pandora, the 10-year-old internet radio pioneer, is huge: Its 76.5 million active listeners represent over 9% of all radio listening in the U.S.

Pandora Media.

The service, which lets you teach it what to play by giving songs either a "thumbs up" or "thumbs down," announced today that users have voted with their thumbs a staggering 50 billion times — the equivalent of seven thumbs for every person on Earth.

Since your thumbs on Pandora directly affect the kind of music you'll hear, users on the service tend to vote in their own interest, creating a relatively authentic profile of their music tastes.

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The Fray, "How to Save a Life" — 15.6 million thumbs up

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