Earlier this month, Aerosmith confirmed that Carrie Underwood had lent her vocals to the band’s upcoming album, Music from Another Dimension.

Now it is said that actor Johnny Depp, former guitarist Rick Dufay and singer-songwriter Julian Lennon (son of John Lennon) also spent time in studio with the band.

Steven Tyler reportedly said that Lennon sings harmony on a song called Love Three Times a Day, which is “Beatlesque.”

Dufay — who was part of Aerosmith in the ’80s — joins Tyler, Joe Perry and the rest on a cover of the Temptation’s hit Shakey Ground. Depp sings backup vocals to Freedom Fighter. However Perry says the politically charged rocker may not make the final album. It may be included in an outtake or on a deluxe edition.

Of Underwood, Perry says he was skeptical. “Their voices matched up really well. It doesn’t sound forced. It was just right.” Season 10 American Idol runner-up Lauren Alaina is also rumored to provide backup vocals for a song.

Music From Another Dimension will be available on Nov. 6.