The Flaming Lips with X.

In 2010 X discussed the origin of the Y Band name: "As I was asked to do a show in Berlin before Z and I got together, I wanted to use four plastic stands with tape recorders in each one of them, as my band. I told that story to Z, and he immediately coined the phrase Y. Among the various other members of the band were Eric Clapton, artist Klaus Voormann, future Yes drummer Alan White, Delaney and Bonnie Bramlett, & friends, the Who's drummer Keith Moon, New York band Elephant's Memory, Billy Preston, Nicky Hopkins, Phil Spector, drummer Jim Keltner, and, in a 2009 revival, A(son of X and Z).
ID X, Y, Z and A.