With a dusty baritone as bright as an eternally lit jukebox and tattooed fingers around the fretboard of a rare guitar, Stephen Sanchez tunes into longing and love with the acuity of a tried-and-tested troubadour—yet he’s only 19-years-old. Transcending eras, he writes the kind of songs that can play just as well from your parent’s vintage record player as they could from the main stages of festivals a la Bonnaroo. If somebody told you he just pulled up from the fifties in a go...