Green Day aren't just making animated cameos in this summer's The Simpsons Movie - they're also writing the theme song. The rockers - who recorded their guitar-heavy take on the TV show's signature tune last year in San Francisco - added lyrics to the Danny Elfman-penned instrumental. The song will be released as a single on July 24th, three days before the film hits theaters, as well as on the soundtrack.

What's this video going to look like when it's done?
I look at this old John Lennon footage, like the sit-in in '68, and there's very much a pseudo-documentary quality to that stuff, like handheld 16mm film. So we're doing the video in black and white, and I'm trying to keep the spirit of John Lennon in the footage. I think it's got the feeling of something that could have been made in the late '60s, early '70s — you know, when people gave a s--- about changing the world. And that I really mean.

“We are excited to be a part of the Signature Series program and proud to partner with Hard Rock for such a great cause,” said Billie Joe Armstrong, lead singer and guitarist of Green Day. “The program is going to provide tremendous support for Amnesty International and Instant Karma, a campaign that we sincerely believe in and are committed to.”