OK - I am in the process of selling an electric guitar that I never play any more, and applying the proceeds to the purchase of a Martin LXM Tres. I discovered this little gem months ago in the back corner of the local music shop collecting dust and missing two strings. I thought it was cool (in fact it is the only Martin 'formica' instrument that I've found interesting) but had no idea what it was. Last week I stopped by to pick up some sheet music and a guitar case, and noticed that the Martin tres had been restrung and tuned. If the pending sale of the guitar goes through, I hope to purchase the tres within the next week or so (the store graciously agreed to put it on hold for me without any down payment until next week). Does anyone out there play a tres? Can you point me to sheet music, instructional materials, etc.? All I've found so far in my initial searches are YouTube videos of people playing the tres. These are great to whet my whistle, but I would love to find some meatier self-teaching materials. Thanks for any help you can offer!