From the mid-1950s to the late 1970s, jazz was harnessed as America’s "sonic weapon" to promote an image to the world of a free and democratic America. Dizzy Gillespie, Dave Brubeck, Duke Ellington and other well-known jazz musicians were sent around the world – including to an array of Communist countries – as "jazz ambassadors" in order to mitigate the negative image associated with dom…