"I didn't want old sounds," says Yoko Ono. "I was concerned with new sounds." On her latest LP, Plastic Ono Band's current lineup – son Sean Lennon, Wilco's Nels Cline, and Cibo Matto's Yuka Honda and Yuko Araki – gets assists from pals like Lenny Kravitz and Beastie Boys Mike D and Adam Horovitz. The highlight? "Little Boy Blue (Your Daddy's Gone)," about missing John Lennon. "Sean and I are always feeling this emptiness," she says. "But he's still with us."