it's theountry music star marty stuart. he has been recording and touring with country legends since he was 13 years old, and collecting all the memorabilia he finds along the way. mark strassmann reports. ♪ ♪ later on you're a grown man cry ♪ >> reporter: on stage, marty stuart always sparkles. from his cowboy clothes to his v virtuosity on the guitar and mandolin. but this country star has also had a side gig for 40 years. >> say hello to george jones' boots. ♪ and you're as smooth >> hello, george jones' boots. >> reporter: as the keeper of nashville's memories. ♪ ♪ how about cooking something up with me ♪ >> reporter: one rhinestone suit at a time, stuart has built one of the largest collections of country music memorabilia in the world, 20,000 pieces in all. a trove of hillbilly treasures. >> it's a great guitar. >> reporter: we all saw this when it was stored in a warehouse outside nashville. but as you're about to hear, all these boots, hats, and guitars. -- so you still play it? >> absolutely. >> repor