When it comes to cutting their money, you can expect a lot of music’s greatest to take action.

Katy PerryBritney SpearsCee Lo GreenNe-YoMaroon 5 and about a hundred other artists have released an open letter to Pandora, regarding their attempt to persuade Congress to pass the Internet Radio Fairness Act, which would reduce the fees the Internet radio service pays for playing artists’ music, saying that this proposal would “gut the royalties that thousands of musicians rely upon.” Click here for more on the story from E Online.