A native of Syracuse, N.Y., Martin Sexton grew up in the ’80s. Uninterested in the music of the day, he fueled his dreams with the timeless sounds of classic rock ’n’ roll. Sexton eventually migrated to Boston, where he began to build a following singing on the streets of Harvard Square, gradually working his way through the scene. His 1992 collection of self-produced demo recordings, In the Journey, was recorded on an old 8-track in a friend’s attic. He managed to sell 20,000 copies out of his guitar case...