Aerosmith

Tyler and Perry said that the singer was working two jobs at the time, shooting Idol during the day then recording with Aerosmith at night. "He did double duty," says Perry. "I never felt for a minute he was lagging in the studio because of his other job. He did his whole thing [on Idol] and then showed up at eight at night and was in the studio until two in the morning."

The new Aerosmith album, Music From Another Dimension!, is expected out later this year. Country-pop star Carrie Underwood duets with Tyler on "Beautiful," which is described as "a country-western crossover ballad." Julian Lennon also sings harmony on the new song "Love Three Times A Day," while actor Johnny Depp contributes backing vocals to "Freedom Fighter," though that song may not make the final track list.