Schuman 3 was given its premiere on October 17, 1941, by the Boston Symphony Orchestra and dedicatee Serge Koussevitzky.

The UK premiere was on July 29, 1943, Sir Adrian Boult conducting the BBC Symphony Orchestra during a BBC Prom at the Royal Albert Hall: https://www.bbc.co.uk/events/eq3p5v

Leonard Slatkin’s DSO performance is here, http://www.colinscolumn.com/another-birthday-present-from-me-to-me-leonard-slatkin-conducts-dso-in-william-schumans-superb-third-symphony-may-7-2016/, also great listening.