In August 1954, trombonist Urbie Green was offered a record date by Vanguard Records. Founded by Maynard and Seymour Solomon as a blues and folk label, Vanguard also recorded jazz, thanks to John Hammond, who had begun serving as the label's de facto jazz a&r man in 1953. Green's four-song session for the 10-inch Vanguard LP is positively remarkable.
How…