Don't know if this one has been posted before, but here's a link to an old (?) interview with HTM. I guess it's from the late 70's.
www.ab-cd.com/mp3s/airmodern/Happy%20The%20Man%20dn.mp3
www.ab-cd.com/mp3s/airmodern/Happy%20The%20Man%20dn.mp3