By JEFF MARTIN, Associated Press

ATLANTA (AP) - Some of the nation's largest recording studios have joined forces in an effort to stop a music streaming service aimed at fitness enthusiasts from using songs by Beyonce, Justin Bieber, Green Day and other stars.

In a federal lawsuit filed in Atlanta, Sony Music Entertainment and more than a dozen other record companies say Fit Radio illegally infringes on their copyrighted recordings "on a massive scale."

The music companies say Fit Radio recruits disc jockeys who upload popular songs to attract users. They say the Atlanta-based streaming business is hurting artists who rely on music royalties to make a living.

A representative of the Atlanta firm said Tuesday that it looks forward to "being vindicated by the court system," and that it will continue providing exceptional service to its customers.

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