BWV 1080 - Art of the Fugue
Anyone here ever read and/or performed the Art of the Fugue? Is this work peculiar for Bach?
For instance, at appr. 57:00, in this video scrolling score, I see four quarter notes moving by in the lower stave, at the same time that 8 quarters are moving by in the upper stave. I interpret this to mean that there are two tempos being used. Am I missing something here?