While he’s too gracious to admit it himself, the Grammy-winning singer, songwriter and musician is living, breathing country-music history. He’s played alongside the masters, from Cash to Lester Flatt, who discovered him; been a worldwide ambassador for Nashville, Bakersfield and points in between; and safeguarded country’s most valuable traditions and physical artifacts. Including its literal shoes: Stuart counts the brogan of Carter Family patriarch A.P. Carter and an assortment of Cash’s black boots among his vast collection of memorabilia.