When musicians start firing off angry letters asking politicians to stop using their music at stump events, you know campaign season is heating up. But on Wednesday, it wasn't Herman Cain, Rick Perry or President Obama who were subject to a terse take-down request. It was Fox News Channel, and the cease and desist came from none other than "The Voice" coach and "Moves Like Jagger" singer Adam Levine of Maroon 5.

Levine did not mince words in calling out the Rupert Murdoch-owned, conservative-leaning news network for playing his band's music, tweeting, "Dear Fox News, don't play our music on your evil [f---ing] channel ever again. Thank you."

When MTV News asked Fox News to comment on Levine's tweet, the channel responded with tweets from anchors Greg Gutfeld and target="_blank">Andy Levy , from "Red Eye With Greg Gutfeld," who offered their opinions of Maroon 5's music.

Levy target="_blank">tweeted , "Dear @AdamLevine, don't make crappy [f---ing] music ever again. Thank you."

At press time, it was still unclear what had raised Levine's ire, but

the tatted-up pop singer has never been shy about expressing his

opinions. Earlier this year, Levine criticized rival reality singing competition "American Idol," slamming the show for its treatment of gay performers. The timing of that missive happened right after Levine had gotten the Glambert nation in a snit over comments he made that appeared to href="http://www.hollywoodreporter.com/idol-worship/adam-adam-levine-disses-lambert-204334" target="_blank">insult "Idol" alum Adam Lambert's hit "Whataya Want From Me."

Levine's type of don't-politicize-my-music request typically comes from musicians who don't agree with the views of candidates who are using their songs to pump up crowds at campaign events. Earlier this year, Tom Petty and Katrina and the Waves both requested that Republican presidential candidate href="http://newsroom.mtv.com/2011/06/29/michele-bachmann-tom-petty-campaign-song-katy-perry/">Michele Bachmann stop playing their songs at her stump speeches; Bachmann initially ignored the cease and desist order from Petty regarding her use of

"American Girl."

The right of politicians to play music at campaign events without the approval of the musician is murky and no one has yet tested the legality of the practice in court.