The actor Johnny Depp contributes backing vocals to the rocker. Depp is no stranger to the world of music, having played slide guitar on the Oasis 1997 track "Fade In-Out
," and also performed on The Pogues' singer Shane MacGowan's first solo album. Perry told Artist Direct
"Steven (Tyler) and I were out in L.A., he was working on American Idol
, which was basically two days a week. The rest of the time we were in the studio. It was so inspiring living out there in L.A. and rubbing elbows with so many musicians. Johnny Depp was one of them. I have to rate him as a first-class musician. As great as an actor as he is, he's also right there as a musician. I guess the acting thing outweighed the music thing way back when, but he's a musician through and through."
Perry explained at the London Listening party how Depp ended up on this song: "Well I needed a guitar, actually. We'd left a lot of stuff in Boston and he's got a great guitar collection and is a great guitar player, great musician and he was down at the studio a couple of times - so I asked him if I could borrow a couple of his axes. So he brought them down and as we were laying the tracks down for this song, by the time we finished it was two in the morning and it was time to do the backing vocals, and usually whoever is left there in the studio will end up doing it. He was there in the studio with some of his buddies so he ended up doing the 'oh yeah's and stuff.
But you can really hear it on the deluxe version of this record," he added, "we have the DVD and he sat down and we kept it rolling and he really got a chance to cut loose."