Jason Aldean Discusses Las Vegas, Performs Tom Petty Song

There was plenty of time for comedy on Saturday Night Live.But, in a break from tradition, the cold open was an emotional appeal for unity by Jason Aldean, who had been performing at the Route 91 Festival as bullets rained down on the crowd in Las Vegas on October 1. He then sang his tribute to the late Tom Petty...with a cover of the 1989 hit I Won't Back Down.