Dave Bruceck has passed, and everywhere on the net, “Take 5” is playing. That’s a wonderful thing, but here’s a lesser known bit of the Brubeck legacy, a musical written by Dave and Iola Brubeck, starring Louis Armstrong and Carmen Mcrae, among others, about the cultural and political paradox that was the US State Department’s Jazz Ambassadors program, during the era of segregation and the Cold War.