Mick Jagger Raps on SuperHeavy Album

Kevin Winter/Getty Images

"It was actually quite difficult," he says of his attempt to keep up with Damian Marley on the microphone.

Mick Jagger deviates from his Rolling Stones sound for his music with new group SuperHeavy, the band he formed with Joss Stone, Dave Stewart, Damian Marley, and A. R. Rahman.

He even tries rapping, he says in a new interview with the Associated Press.

STORY: Mick Jagger's New Group SuperHeavy Unveils Music

"I was just copying Damian. I do a little bit," Jagger says. "I went toasting, we call it, but it is the same thing [as rap]. Damian was doing this really good toasting, West Indian rapping, so I thought, "I could do that. It can't be that difficult." It actually was quite difficult. With a bit of practice, it is all right. It is a laugh."

The 12-track, self-titled album isn't a specific genre, he says.

"We were just making music and if we didn't like it, we wouldn't use it," Stewart tells the AP. "We just did it because we wanted to do an experiment, and that got developed and more and more developed until in the end, this record appeared."

STORY: Mick Jagger's SuperHeavy Supergroup to Drop Album in September

The night before they went into the recording studio, "I said to Dave… 'Is this really stupid?'" admits Jagger. "We always have songs going into projects. We make up songs when we are there. That is great, but we always have songs finished going in."

PHOTOS: Grammys: Top 10 Must-See Moments

"I said, 'We are going into this thing we have talked about for the last three months or whatever, and we don't have any finished songs.' Dave said, 'I know. It is really worrying," Jagger goes on. "But then Dave created this whole raison d'etre why we didn't have songs. The raison d'etre for why we didn't have songs was because if we had songs ... people would feel that it wasn't their project as much. People wouldn't participate and give as much, which is true. So we were all thrown in the deep end."

STORY: Joss Stone Talks 'LP1,' Staying Positive After Murder/Kidnap Attempt

But Jagger didn't have much to worry about.

"Every time you get into a room even with the same people, it is different because people come up with different things. It was a really interesting collaboration. To be honest it was easy. It was really easy because we got things straight away. You are very soon encouraged," he says.