Workers Union (Andriessen)

[1] It is a melodically indeterminate piece; this means there is no key and no defined melody.

Sections may be repeated as many times as the conductor wishes, resulting in varying performance lengths.

Every instrument plays different notes that follow the same rhythm and ascending or descending patterns.

If executed properly, the piece sounds mechanical as the instrumentation operates in perfect unison.

Notes that are written above the line should be played higher than the preselected pitch and vice versa.