Percy Grainger: "Free Music No. 1"

Here is an animated version of the score for Free Music No. 1 posted to youtube by Cat Hope. This piece is traditionally performed on four theremins.

By scrolling the score a precise performance can more easily be achieved compared to reading the piece from the paper score and using a stopwatch.

Kind of like a continuous version of the Spectrogram invented by Hugh Le Caine.

Does the video have sound?  If so I'm not hearing it.