Bruce Springsteen told Rolling Stone that he's working on the follow-up to last year's 'Wrecking Ball' album. He even spent a day recently in a Sydney studio with Rage Against the Machine guitarist Tom Morello.

"I have stuff I'm working on that I'm very happy about," Springsteen said in the interview, which took place backstage at a concert the Boss was performing in Milan earlier this month. "I hate to say, because I don't like to be wrong. But I have a lot of material. I still feel like I'm in the middle of the well."

Springsteen is making the most of his current European tour. During the Australian leg in March, he and members of the E Street Band went into a studio and recorded some potential tracks for the new album. Morello joined them, since he was filling in for Steven Van Zandt, who took some time off from the group to work on the Netflix series 'Lilyhammer,' which he stars in.

"We've never had a recording session during a tour in our lives," Springsteen said. "We did a couple of things that I wanted to put down. So that was very exciting. And being with Tommy was exciting. The band – Steven, Nils, all those guys – continues to be a source of inspiration for me."

No details on the new album -- like track listing or release date -- have emerged. But Springsteen acknowledged his commitment to putting out new music as often as he can (he's released six album since 2002). "I always used to say, in the past decades, that I wanted to make more records – and I've done that," he said. "I struggled through the '90s ... But this has been a great, tremendously rewarding period of our time together. This has been the best 10, 12 years we've ever had."