This selection was performed with each member of the Arditti Quartet playing their instruments separately, in four different classrooms at the Kurten School Center. The sounds of helicopter rotor blades, turbulence and engine noise were recorded separately and mixed by Karlheinz Stockhausen in February 1999.

1995 Sony Music Entertainment. Hole punch in UPC.

1992 Atlantic Records

2007 Virgin Records. Hole punch in UPC.