dorm, at the holman correctional facility in alabama, to learn how right he was. >> that's all i play, blues, country and old rock 'n' roll. i don't mess with the hard rock stuff. >> while robert tetter passes time playing music, that's not what amazed our crew. it's that tetter builds his own guitars out of one of the few recreational resources ahowed inmates, model boat kits. >> this is 2 1/2 boat kits makes this one. all of these are stood up together, glued together, to make this neck like this and down inside of it we have one radio. the tone control, three controls down here, the set of batteries, and this one back here is the mic mixer. then we use magnets to hold the lid on it. ♪ >> tetter always includes one other element on his guitars.