Workers Union

Workers Union is a composition by Louis Andriessen intended for any loud-sounding group of instruments. It was originally written for the orchestra De Volharding. This performance of Workers Union by orchestra De Volharding was recorded in 1991.

This piece is a combination of individual freedom and severe discipline: its rhythm is exactly fixed; the pitch, on the other hand, is indicated only approximately, on a single-lined stave.
It is difficult to play in an ensemble and to remain in step, sort of thing like organising and carrying on political action. 

Louis Andriessen

 [Source: Boosey & Hawkes]