I think his talk on "sounds" is more interesting. He basically foresaw concepts that only today, with digitally recorded data, could we conceive of. The idea of changing the duration of music without changing it's pitch. Now we can do this with software. He was talking about talking about doing this with a piece of classical music. The whole context changes. A 30 minute symphony condensed into 2 seconds, the sounds is radically different. A 2 minute song stretched into 30 minutes, etc. Not like slowing or speeding up a record since the pitch would not change. Ahead of his time.