Daly honors Tom Petty with 'I Won't Back Down'

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If you thought John Daly only knew how to play "Knockin' on Heaven's Door," well ... well, you're not alone.

Daly, however, joined Gavin DeGraw Thursday night, following the opening day of the Safeway Open at Silverado Resort & Spa, and the two sang "I Won't Back Down," in honor of Tom Petty, who died this week of cardiac arrest.

Take a listen: