Meeting culture in the middle meant Armstrong could change things from within. The list of firsts he oversaw is staggering. Knockin’ a Jug, which featured black and white musicians, was one of the US’s first integrated recordings. That same year, he cut the first integrated vocal duet, Rockin’ Chair, with white singer Hoagy Carmichael. Black and Blue, a 1929 B-side on Okeh Records’ “popular music” listings (a label that had previously marketed him for “race records”), has been called American music’s first bona fideprotest song against racial inequality. – The Guardian