Couple of interesting facts about Van Dyke Parks, aside from his having auditioned for the Monkees, which I believe I dealt with in another post.
A little bit after that, he was a member of the Mothers of Invention. For, like, a couple of weeks. By the time they recorded Freak Out! he was gone. It seems to have been rather easy to fall out with Frank Zappa, and he did.
Also, at the time he recorded Song Cycle he was highly influenced by Mexican keyboardist and composer Juan Garcia Esquivel. The above song doesn't really sound like Esquivel, but there is a similar sense of playing around with the listener's stereo equipment and headspace.