This documentary is BRILLIANT! I had the luck of seeing Ken Russel speak and present three of his films at a film festival last year. My friend and I got an interview with him for a news article, he told us the whole story about the Strauss estate. Apparently he swiped a copy of the original reel, and has been carrying it around ever since the 70's. The film depicts Strauss having a picnic with Hitler (because of his supposed connections with the Nazi party) and letting Hitler ride upon his shoulders as they frolic through a feild, handing out Strauss' records which have a swastikas in the centers.
The music goes so well with the scenes, it was a long documentary but I laughed almost all the way through it. I hope others are able to see it eventually.