The music of Jonathan Vassar is what folk music would be described as in a book by Phillip K. Dick: intimate and mysterious. The diction and cadence of his voice and lyrics recall pure William Faulkner. Vassar’s elemental poetic style doesn’t pigeonhole consciousness. Listening to his impressionistic Americana, you get the sense that he’s as influenced by E.E. Cummings as he is by Cisco Houston or Woody Guthrie. There’s an elegiac quality to his music, but it never wallows in pity. He sketches out his characters and allows the listener to fill in the blanks. Vassar celebrates the release of his solo EP, “Blue Hearts,” on Sunday, July 20, at the Camel. Openers are fellow modern troubadours David Dondero, Russell Lacy and Mermaids, I Mean Whales. Doors open for the all-ages show at 7 p.m. Admission is $8 and includes a copy of the new release. thecamel.org.