Every time I see Willie Nelson's guitar, I am amazed that the instrument is still capable of putting out good sound. It is a Martin N-20 nylon-string acoustic guitar named Trigger after Roy Rogers' horse and was purchased sight-unseen by Nelson in 1969 for $750. He estimates that nearly 100 friends' names are carved into the guitar and he even went so far as to put the guitar into hiding during his tangles with the IRS. The guitar also has its own 24-hour bodyguard.