Trigger is a modified Martin N-20 nylon-string classical acoustic guitar used by country music singer-songwriter Willie Nelson.

In 1969, before a concert at Panamerican Ballroom near Houston, Texas, the Baldwin Company gave Nelson the 800C Classical Acoustic-Electric Guitar model with a Prismatone pickup and an amplifier to test.

David Zettner and Jimmy Day (members of Nelson's band The Record Men) took the guitar to Shot Jackson, a luthier in Nashville, Tennessee.

[3] Jackson considered the damage irreparable and offered Nelson a Martin N-20 nylon-stringed classical guitar made out of Brazilian rosewood with a Sitka spruce top (serial number 242830).

[5] The pickup allowed him to amplify his classical acoustic sound to perform in large dance halls, contributing to his signature style.

[1] Nelson first used Trigger during the studio recordings of My Own Peculiar Way the same year, but the sound of the guitar was overwhelmed by the dubbing of strings and brass instruments on the mix.

[10] In his book, The Tao of Willie: A Guide to Happiness in Your Heart, Nelson described the influence of the guitar in his style: "One of the secrets to my sound is almost beyond explanation.

If I picked up the finest guitar made this year and tried to play my solos exactly the way you heard them on the radio or even at last night's show, I'd always be a copy of myself and we'd all end up bored.

Directed by David Chamberlin and narrated by Woody Harrelson, the film features interviews with Nelson, his biographer Joe Nick Patoski, harmonicist Mickey Raphael, and singer Jerry Jeff Walker.