A free Prince tribute concert was held at L.A.’s City Hall last night, which the one and only Stevie Wonder closed out with an emotional cover of “Purple Rain.†“What an incredible life, music, and legacy that he gave us,†Wonder said. “I think the only thing we can do, in the spirit of Prince, is to learn to truly love one another and come together. And we can’t just talk about it, we gotta be about it.â€