Watch it again from about 2:28 - 3:45. He does talk about it and says he lost it. I, of course, have all 3 on vinyl and CD 😁 I must have been away at school when the single came out. Interestingly, being away at school, I didn't know about the 3rd LP either, but to my surprise I found it in a record shop in Ft. Lauderdale and snapped it up there. I didn't know about the single until a few years ago when I found it on YouTube. So I was able to get it there as well as the 12th Brigade from 3 Part Inventions.