https://youtu.be/_04Gj6kvz24I don’t think it’s been mentioned on the board but a few months back, by way of marking both the 55th anniversary of Song Cycle’s release and his 80th birthday, Van Dyke did a podcast, over an hour and a half long, where he and Richard Henderson who wrote the 33 1/3 book on the album discussed its making, track by track, going into more detail about the process of its writing and recording than I can remember him doing in any previous interview. He also talks about his pre-SC career a little, focusing a bit more on his MGM era than on Smile. Besides the YT link above the podcast can be found at Apple and the other usual suspects.