Instrumentation Works for Orchestra
Karlheinz Stockhausen
Instrumentation Works for Orchestra
MIXTUR
MIXTUR for orchestra (small ensemble), sine—wave generators and ring—modulators
| SCH = PERCUSSION |
| H = WOODWIND |
| B = BRASS |
| P = PIZZICATO |
| S = STRINGS |
There is only one part for each group of instruments. All parts have the same page numbers in the upper right hand corner as in the score. 2 players read from one part and have 2 stands.
| SCH | 3 percussionists: each 1 cymbal
 1 tam-tam
  |
each is suspended with several leather straps; for each and each 1 contact microphone fastened onto the straps
or onto the surface of the instruments. |
| H | flute (also piccolo) (F1) | |
| oboe (Ob) | ||
clarinet (also  clarinet and bass clarinet) (Kl, Es—Kl, Bkl) |
||
| bassoon (also contrabassoon) (Fg, CFg) | ||
| B | trumpet (Tp) | Tp and Ps require 3 mutes: straight, cup, wawa. |
| trombone (with thumb valve) (Ps) | ||
| high horn (1. Hn) | ||
| low horn (2. Hn) | ||
| P | 2 violins I ( V1 I ) | |
| 2 violins II ( V1 II ) | ||
| 2 violas (V1a) | ||
| violoncello (Vc) | ||
| contrabass (Cb) | ||
| S | 2 violins I | |
| 2 violins II | ||
| 2 violas | ||
| violoncello | ||
| contrabass |
The parts include transpositions for piccolo, 
clarinet, clarinet, bass clarinet, contrabassoon, F horns (1. Hn high sounds a 5th lower, 2. Hn low sounds a 4th higher), contrabass.
The contact microphones of the 3 percussionists are to be connected to 3 loudspeakers (see position in the plan).
Each of the groups H B P S should sit concentrated and be separated from the others as much as possible. Every woodwind and brass player and every desk of violins and violas has a microphone; all Vc and Cb have individual microphones. The 4 microphone groups H B P S are each balanced in a mixer by a sound technician sitting with his group. The sum of each group is connected to a separate ringmodulator (if possible, special modulators, which give only the primary sum and difference frequencies).
4 further players, who also sit with their groups, each operate a beat frequency oscillator (sine-wave generator with continuously changeable frequency from 1 - or if possible a still lower frequency - to 4200 Hz). Each of these beat frequency oscillators is connected to one of the modulators. The oscillators are indicated in the score by ~.