Neil Young went from guest to fill-in when Pearl Jam singer Eddie Vedder walked off with the flu.
Vedder called it quits after six songs Saturday night at Golden Gate Park. He had been treated at a hospital before the show.
Young mixed classics with new songs from his album Mirror Ball.
"We don't care if he (Vedder) is puking," said Lissa Harrison of Dublin, Calif. "I didn't go to Neil Young. I came to Pearl Jam."