At The New Yorker Festival, Dave Grohl talked with Kelefa Sanneh about Grohl’s new book, “The Storyteller: Tales of Life and Music.” Grohl, who was the drummer for Nirvana and then the frontman of the Foo Fighters, recalls his earliest experiences of taking music seriously—harmonizing with his mom to Carly Simon on the car radio. Grohl also talks about what it was like to collaborate with Kurt Cobain, who was known for his capricious genius, and about stepping out from behind the drums to lead his own band. “After Kurt died, I was, like, I’m not playing music anymore—it’s painful,” he remembers. “And then I eventually realized that if music saved my life, my entire life, this is what’s going to save my life again.”