Metallica’s Kirk Hammett has been hard at work. Fresh off the release of a new coffee-table book showcasing his guitar collection, Hammett has revealed that he’s prepping his first full-length solo album, and that he has over 700 riffs stockpiled for Metallica’s next LP.

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“I’m just actively getting ideas together for my [first] solo album,” he told Rolling Stone in a new interview. “I guess the best way to describe it is it’s gonna be a fusion of all sorts of styles…. All of a sudden I’m writing classical progressions, and all of a sudden I’m writing more heavy stuff and all of a sudden I’m writing like a funk thing….”

Hammett released the Portals EP, back in 2022. While that four-song release included instrumental pieces, the forthcoming full-length will feature vocals, though Hammett hasn’t settled on any singers just yet.