Roger Waters is recording his first new rock album in 21 years.

Speaking to Rolling Stone, Waters confirmed, “It’s 55 minutes long. It’s songs and theater as well. I don’t want to give too much away, but it’s couched as a radio play. It has characters who speak to each other, and it’s a quest. It’s about an old man and a young child trying to figure out why they are killing the children.”

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Waters last rock album was 1992’s Amused To Death, though in 2005 he released Ça Ira, a three-act opera.

Waters recently finished his 219 date tour of The Wall. He told Rolling Stone he has no immediate plans to support the new album with live shows.

“I’m suffering a little bit of withdrawal after ending the Wall tour,” he said. “It’s sort of a relief to not have to go out and do that every night, but they’re such a great team. There were 180 of us together everyday. That piece was very moving every night.”