The potential disappearance of stuff like this: one more reason it would suck if the site went out-and-out corporate.
(Wait -- have they?)
Anyway, whatever you think of the tune, ya gotta dig a quartet of dancing timpani players.
(And yes, the singers here are the very same "Peanuts" who appeared to great effect in various Godzilla movies. Here they perform one of their hits: "Koi no Fuga.")