It's Immaterial - summer winds, 1990

"Held in high esteem by Its Immaterial fans, Song was retrospectively described by Whitehead as "the It's Immaterial idea to an extreme," while Campbell said that he and Whitehead "were very proud of what we'd offered. If you look at what you're trying to produce as works of art, I actually thought Song was the nearest I'd got to something that would actually stand the test of time. And I think it's proven that."