On a recent Friday afternoon, all of that was relegated to a back shelf of his mind as he caressed a shiny, new Yamaha acoustic guitar. Mathes is one of more than 2,000 veterans who have completed a unique music therapy program designed for those who struggle with post-traumatic stress disorder and other forms of emotional distress. After referral by a medical care provider, vets get 10 weekly lessons from a volunteer instructor. A pilot study in Milwaukee found that the program was effective in reducing symptoms of PTSD and depression and improving quality of life. [...] vets get their personal guitars, they use loaners donated by individuals and music companies. The nonprofit gets support from donors including the band Lynyrd Skynyrd and the Les Paul Foundation, which carries on the guitar pioneer's legacy. The course is an introduction to guitar basics, focusing on technique, music theory and sight reading. Learning guitar is an ideal form of therapy because of the demands it places on the student, Durig said. [...] Durig said, it doesn't matter.