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Music From Another Dimension! finds the band working with a number of familiar faces: producer Jack Douglas (who helmed classic Seventies Aerosmith albums like Rocks and Toys in the Attic), songwriter Diane Warren and even guitarist Rick Dufay, who briefly replaced Brad Whitford in the early Eighties. Dufay joined the band on a cover of the Temptations' 1975 hit "Shakey Ground," which Tyler had initially planned to include on a solo album.
The album also includes a number of newer acquaintances. Perry says he was initially skeptical about Carrie Underwood dueting with Tyler on "Beautiful," which Tyler describes as "a country-western crossover ballad." But Perry was won over: "Their voices matched up really well. It doesn't sound forced. It was just right." While in Los Angeles working on Idol, Tyler met Julian Lennon in his hotel, and Lennon wound up contributing harmony vocals to "Love Three Times a Day," which Tyler not surprisingly describes as "Beatlesque." "He's such a sweet fucking guy," Tyler says. "And he's John's first son with that voice and sense of humor – gimme a break!" Johnny Depp also added backup vocals to Perry's politically conscious rocker "Freedom Fighter," but the song may end up an outtake or on a later deluxe edition of the album, according to Perry.