. >> while robert tetter passes time playing music, that's not what amazed our crew.that tetter builds his own guitars out of one of the few recreational resources allowed 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. it's for his muse. >> everything i do i dedicate to my wife. the blue heart is because we've been separated for 23 years now. and she's still with me. she's sticking with me right through this. and i always put a blue heart on every letter i mail to her. every card i send her. and i put a blue heart on the case and on the guitar. it's just our symbol. being separated so long. ♪ >> while music helps tetter cope with life at holman we met another inmate who finds his aggressive tendencies are soothed in the