We all know the tale of Willie Nelson. How he left Nashville, for his home of Texas -- and ultimately become Country Music royalty. We all know his famous guitar too, "Trigger." But do you know the story behind Trigger?

Trigger, a beat-up, autograph-covered Martin N-20 acoustic, is just as recognizable as Nelson himself. And in the debut documentary in our "Mastering the Craft" series by Rolling StoneFilms presented by Patrón, MaggieVision Productions and director David Chamberlin interview Nelson, his band and crew — plus friends including Jerry Jeff Walker, music journalist Joe Nick Patoski and fans like Woody Harrelson, who provides the documentary's voiceover — to tell the story of how this instrument helped change music history.

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