Martin OMJM John Mayer 20th Anniversary Fishman The control panel on the

The control panel on the top right offers the possibility to adjust the "Triple-Tweeter-System"

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Martin OMJM John Mayer 20th Anniversary Fishman The control panel on theThe OMJM John Mayer 20th Anniversary is yet another confirmation of why the marriage between John Mayer & Martin is so special. It's been twenty years since Martin & John Mayer joined forces for the original OMJM guitar and of course that can't just pass by. Once again, John & Martin joined forces to create a fantastic anniversary guitar. First of all, there is of course the immediately eye catching Gray Sunburst finish that makes this Martin a real