“A lot of artists, when they’re 62 years old, they’re winding things down,” Metallica’s Kirk Hammett says in the new episode of our Rolling Stone Music Now podcast. “I feel like I’m still fucking climbing the summit, bro.”

Hammett has a new coffee-table book out, The Collection: Kirk Hammett, with highlights from his massive assemblage of vintage instruments. He took the occasion to look back at his entire career with Metallica, and what’s coming next — including his first-ever full-length solo album. Here’s the entire conversation — to hear an audio version,...