In 1970, nine years after leaving the United States to study music in Canada, Beverly Glenn-Copeland released two self-titled albums. Both were a stunning showcase of classical and jazz acumen, layered with poetry and accompanied by some of the best players of the time. Original pressings now fetch thousands of dollars. Glenn-Copeland then vanished as a recording artist until his re-emergence in 1986 with the release of what many now believe to be...