From David Remnick's excellent profile in The New Yorker:
As he talks, he keeps his eyes fixed on the stage, where a young guitar player is strenuously performing an overstuffed solo on “Sweet Home Chicago.” In this club, you are as likely to hear that song as you are to hear “When the Saints Go Marching In” at Preservation Hall. The youngster is a reverent preservationist, playing the familiar licks and enacting the familiar exertions: the scrunched face, the eyes squeezed shut, the neck craned back, all the better to advertise emotional transport and the demands of technical virtuosity. It’s fair to say that Buddy Guy, having done much to invent these licks and these moves, is not impressed. The homage being paid seems only to embarrass him. He is generous to young musicians who earn his notice—he even brings them up onstage, giving them a chance to shine in his reflected prestige—but he does not grade on a curve. The tradition will not allow it. Guy turns away from the stage and takes another sip of his drink, Heineken diluted by a glass full of ice.
“The young man might consider another song,” he says.