“Louis Armstrong's Black & Blues” offers an intimate and revealing look at the world-changing musician, presented through a lens of archival footage and never-before-heard home recordings and personal conversations. This definitive documentary, directed by Sacha Jenkins, honors Armstrong's legacy as a founding father of jazz, one of the first internationally known and beloved stars, and a cultural ambassador of the United States. The film shows how Armstrong’s own life spans the shift from the Civil War to the Civil Rights movement, and how he became a lightning rod figure in that turbulent era.…