Legendary rapper LL Cool J is coming after the promoters of the hip-hop festival 'Rock The Bells', accusing them of ripping off a song title of his.

According to court documents obtained by The Blast, LL is suing Guerilla Union, Inc.

LL Cool J is alleging that its founder, Chang Weisberg, filed to trademark “Rock the Bells” back in 2004. LL released a song called “Rock the Bells” in 1985 and also launched a SiriusXM hip-hop channel with the same name earlier this year.

The Blast reports that Guerilla Union applied for the trademark without his permission and used the name through 2013. LL petitioned the Trademark Trial and Appeal Board to cancel all of Guerilla Union’s trademarks, which the board granted last year. He is also claiming that the concert promoter still tries to use and trademark the name for various purposes.

LL is suing for unspecified damages.