I'm also probably going to work on nanowrimo this month... The midnight start just isn't going to happen (am far too brain-dead for anything of that nature right now) but something might show up later today or some time next week. If anyone actually wants to read whatever rubbish I manage to churn out, and doesn't see a nanowrimo message immediately above this one, let me know here and I'll add you to the nanowrimo filter.
Anyway, just before I went off line I discovered what's probably the main evidence for the claim that Len Lye accidentally invented the music video:
What I noticed, most of all, was how the visual themes changed depending on which instrument was most prominent... vertical lines for the violin, dots for the piano, etc.