When he was 12, Joey Armstrong triumphantly walked off the stage after his band finished its first-ever performance. His preteen punk band had won over some new fans and, more important, his secret was still safe.
Or so he thought — until the following act's singer grabbed the microphone.
"Then he said, 'Give a round of applause for Lil' Green Day,'" Armstrong said. "I was really bummed out."
Armstrong, now 17, is the son of Billie Joe Armstrong, frontman for Green Day, one of rock's most successful acts. He's also still the drummer of his first band, Emily's Army, a punk-pop quartet from Oakland, Calif., that plays the annual Insubordination...