Impressive shot
There's a great shot in the scene where Cregar finally performs his piece.
First of all, he's doing a VERY good job at finger-synching, and Alan Napier is one of the few actors who conducts an orchestra convincingly.
But watch that scene again! Director John Brahm does an incredibly long single shot that begins with the piano, sweeps through the entire audience, and ends back at the musical performance again. All this had to be coordinated to the playback of Herrmann's music. Hats off to the director and all involved!