Fans of the prog rock group Emerson, Lake and Palmer will soon be able to read the band’s story in an official book, Rolling Stone reports.

Rocket 88 will publish ELP later this year. The publisher calls it “the first official, illustrated book to tell the remarkable and unique Emerson, Lake [and] Palmer story by the artists.”

The book is edited by Carl Palmer, the band’s sole surviving member, and the families of the late Keith Emerson and Greg Lake. Emerson took his own life in 2016; Lake died of cancer later that year.

“Created from over a quarter of a million words spoken by the musicians in original and unpublished interviews, recordings and films, the text is illustrated throughout with classic, rare, private and recently discovered photos of the men, the band, and the world they created,” the publisher said.

Emerson, Lake and Palmer were founded in 1970, and released several hit albums, including Tarkus and Trilogy, both now considered prog rock classics.

ELP will come in three editions, including two autographed by Palmer and relatives of Emerson and Lake.

“There are photographs which I’ve never, ever seen before—can you imagine, after all this time?” Palmer said. “This is the story as it happened, as the group told it, because it’s in our own words. What a fantastic book.”

There’s no release date as yet for the book, but fans can sign up to receive news about it on the book’s webpage.

Michael Schaub is a Texas-based journalist and regular contributor to NPR.