Bob Drake is playing his first-ever all-solo show in nearly four decades of performing music internationally. Hardly a pop star, Drake is nevertheless a legend in Denver avant-garde music circles and an accomplished sound engineer whose production flourishes grace the work of mainstream artists. He grew up in Ohio and Illinois, but when he moved to Denver in 1978, he met people who shared his interest in progressive rock, particularly the truly experimental Henry Cow. One of his new acquaintances was Mike Johnson, and the two played together in cover bands before forming Thinking Plague in 1982. That band and like-minded artists formed a loose community that made Denver a mini-hotbed of strange yet artistically respectable music in the early ’80s.