Photographs taken throughout Willie Nelson's career show the gradual evolution of his famous guitar (nicknamed Trigger) from its pristine new condition to its current weathered look. Much like Willie, this famous guitar has come a long way. Trigger has been played so much, there is a rather sizable hole worn right through the top, one that Willie considers so sentimental, he won't have it repaired. In addition, Nelson estimates that he has 100 signatures on his Martin including those of Leon Russell, Roger Miller, Kris Kristofferson, Gene Autry, Johnny Cash, Waylon Jennings, lawyers, football coaches, and other friends and associates. When asked why his guitar is named Trigger, Willie explains: "Roy Rodgers had a horse named Trigger. I figured: "This is my horse!"