"In 1975, Lou Reed gave Andy Warhol a BASF C-90 cassette. One side was a mix of live Reed songs recorded at recent tour dates. The other was an apparently homemade demo of a dozen songs based on his friend and mentor’s newly-published The Philosophy of Andy Warhol: From A to B & Back Again,
The story of the “Philosophy Songs” tape came to light this fall when Cornell professor Judith Peraino published an essay called “I’ll Be Your Mixtape: Lou Reed, Andy Warhol, and the Queer Intimacies of Cassettes” in The Journal of Musicology. (Full disclosure: Peraino is a friend.) The recordings had been but a rumor among Reed superfans, and the existence of an actual tape of them in the Andy Warhol Museum archives in Pittsburgh made news internationally, in spite of the fact that almost no one could hear it.