David Gilmour gives a surprise performance with his daughter of Pink Floyd's beautiful song "Wish You Were Here".When she saw him, she exclaimed "My God, you're here. And you brought your guitar!" at which point a beaming David made his way through the crowd to join his daughter on the venue's small stage. "You're coming to upstage me? Okay, cool," laughed his daughter.Seeing father and daughter performing together is magnificent. What a connection. And how lucky to be able to say that David Gil