"Blue Waltz" is a performance by John Coltrane's Quartet of the main theme of John Coltrane's "Ascension", a much larger work recorded six weeks before this concert.This is extremely intense music. Even so, the "Ascension" performance which I'm pointing to on Rhapsody dwarfs this. Some who heard Ascension said it was one of the most powerful sounds ever recorded by humans. I had to listen to "Ascension" in small measured doses turned way down before I acclimated enough so that I could start to appreciate it.I'm very glad that this video has come to light. It presents the quartet during one of its most creative and inspired periods. The night before at this festival, they had done the first public performance of Coltrane's suite "A Love Supreme". McCoy Tyner takes a mighty solo during on this tune. The camera work during the solo shows how Elvin Jones and McCoy locked in with one another and moved musical mountains together along with bassist Jimmy Garrison. Andrew White, the saxophonist who has transcribed nearly all of Coltrane's solos, would probably list this as "Ridiculous" on the scale of technical difficulty that he uses to rate the solos in his catalog. (I'll have to check to see if he's done this).