Laurie Spiegel, Harmonices Mundi (one-sided LP)

Harmonices Mundi is a one-sided LP from New York computer music innovator Laurie Spiegel. It was recorded in 1977 for inclusion on the Voyager spacecraft, but not released in a commercial format until this 2003 LP. The back of the album is covered with a crazy space-themed image, that can be mostly seen backwards through the clear yellow vinyl while the record plays. The music starts as a slowly evolving, largely unfiltered, high-pitched drone, and additional layers of busier drone are very slowly added through the course of the piece.