What makes a vintage guitar so special? Time is the secret ingredient. With each passing year a guitar's sound mellows and refines. But with each passing year a guitar's shape declines. That's why George Gruhn of Gruhn Guitars in Nashville puts such value on his staff of highly trained guitar repairmen. They employ tricks of the trade to revive instruments like a Martin D18 that would be otherwise lost without their help. Host Jeff Wilson pries those secrets out of the Gruhn staff to reveal helpful tips from the art of guitar and instrument restoration and repair.