John Cage (1912-1992) & Lejaren Hiller (1924-1994) – HPSCHD for Harpsichords & Computer-Generated Sound Tapes (1967-1969)
Including KNOBS computer printout for playback control
ANTOINETTE VISCHER Neupert Bach-model (Solo II)
NEELY BRUCE Hubbard double with 17% Eltro time compression (Solo VI)
DAVID TUDOR Baldwin solid-body electronic harpsichord (Solo I)
Released 1971 by Nonesuch Records H-71224
Recorded April 1969 at the State University University of New York at Buffalo.
Messrs. Cage and Hiller gratefully acknowledge the special assistance of Laetitia Snow, who wrote some of the original computer programming for HPSCHD; James Cuomo, who helped prepare the original sound tapes with ILLIAC II; Jaap Spek, who supervised the technical processing of the tape collage; and George Ritscher, who engineered the final recording.
This recording of HPSCHD was made possible through use of facilities of the Experimental Music Studio and the Department of Computer Science of the University of Illinois, Urbana.
The computer-output sheet included in this album is one of 10,000 different numbered solutions of the program KNOBS. It enables the listener who follows its instructions to become a performer of this recording of HPSCHD.
Preparation of this material was made possible through the Computing Center of the State University of New York at Buffalo.

00:00 Introduction and instruction
05:00 -26’00 HPSCHD
PROGRAM (KNOBS) F0R THE LISTENER OUTPUT SHEET No. 2245
Instruction
The unique set of results given below were genrated by means of a program run on the cdc-6400 computer located at the State University of New York at Buffalo in April 1969.

The values listed in the colomn labeled (time) represent 5 second increments in elapsed duration from the beginning of the composition. The numbers in the six other colomns are randomly generated settings of the volume control and the treble and bass controls for the left and right chanels respectively of your amplifier.
Whenever 0 appears, turn the knob in question full left. Whenever 4 appears, turn the knob full right. Whenever 1, 2 or 3 appears, select the appropriate intermediate position. These three intermediate positions should be equally spaced between the extremes.
If your amplifier has only one volume control and a balance control, interpret (ch.1) as the volume control and (ch.2) as the balance control.
Good luck, John Cage and Lejaren Hiller

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