John Cage performs "Water Walk" on American game show, 1960
This is utterly charming. (One of the commenters prefers "delightful", which I also find an acceptable description.) John Cage performs a piece for a completely non-avant garde audience (at least, I think so: you never see the studio audience), so the host is obliged to try to explain Cage's work and status (the word "controversial" is used). The commentors make much of the fact that you'd never see something like this on today's mainstream television.