Bart Simpson said sorry to the band via the blackboard in the opening credits of the show

The Simpsons have apologised for calling Judas Priest a ‘death metal’ band in a recent episode.

Bart Simpson used the blackboard in the show’s opening credits to say sorry to the band, writing ‘Judas Priest Is Not “Death Metal”‘ after they were referred to as such on the show earlier this month, incurring the wrath of fans of the band, who state that the rock group are not part of the death metal sub-genre, reports The Guardian.

The episode, titled ‘Steal This Episode’, saw the British band make an appearance to perform their song ‘Breaking The Law’ in an attempt to lure Homer Simpson out of Springfield’s Swedish embassy where he was hiding from police. The episode featured a host of guest stars, including Will Arnett, Channing Tatum, director Judd Apatow, Leslie Mann, Paul Rudd and Seth Rogen.

Speaking to Entertainment Weekly, executive producer Matt Selman explained that Homer becomes a wanted man after screening illegally downloaded films for the people of Springfield at his house. “Even though Homer is stealing, he’s doing it for the community, he’s doing it out of the goodness of his heart,” says Selman. An FBI agent, voiced by Arnett, pursues Homer’s arrest and recruits Judas Priest to help.

Judas Priest join a long list of musicians who have made a guest appearance in the series including Tom Waits, Smashing Pumpkins, The White Stripes, Red Hot Chili Peppers, U2, Lady Gaga, Sonic Youth and The Decemberists. To see NME.COM‘s gallery of classic band cameos in The Simpsons, click here.