Wall Drug were an improvisational rock trio, led by one R. Thak Phoenix Prudhomme, with Mark Ibold (Pavement, Free Kitten) and the Austrian drummer Martin Köb (Circle X, Loudspeaker.) Their refreshing, throw-it-at-the-tape-and-see-what-sticks attitude bore a perhaps surprising amount of good material, issued both in the form of cassette-only releases and as contributions to compilation CDs.