Music in Twelve Parts
Encyclopedia
Music in Twelve Parts is a set of twelve pieces written between 1971 and 1974 by the 20th century composer Philip Glass
Philip Glass
Philip Glass is an American composer. He is considered to be one of the most influential composers of the late 20th century and is widely acknowledged as a composer who has brought art music to the public .His music is often described as minimalist, along with...

.
The eleven instruments in this work cycle are played by five musicians:
three electric organs, two flutes, four saxophones (2 sopr, 1 alto, 1 tenor) and one female voice. Only the organ can be heard always, the other instruments are not playing simultaneously the whole time. Only one piece was originally written, called "Music in Twelve Parts" because it was originally intended to have twelve lines of counterpoint harmony, but when he played it to a friend, she asked him what the other eleven parts would be like. He found the misunderstanding interesting, and wrote another eleven parts over a period of three years. The entire set can be over three hours long when performed. In these works, Glass uses repetitive structures often associated with musical minimalism
Minimalism
Minimalism describes movements in various forms of art and design, especially visual art and music, where the work is set out to expose the essence, essentials or identity of a subject through eliminating all non-essential forms, features or concepts...

. Despite this, many of the works display a great deal of variety and invention. The music develops slowly, and there are long periods during which a casual listener would not notice any change. If one listens closely, however, this is seen to be an illusion, since patterns actually change form almost continuously, though nearly imperceptibly. The pieces are therefore challenging to the listener, but they have still enjoyed a significant level of popularity and are often cited as a major work of the second half of the 20th century. The works show a great emphasis on development and slow alteration, with different pieces utilizing different techniques for development.

Andrew Porter for The New Yorker
The New Yorker
The New Yorker is an American magazine of reportage, commentary, criticism, essays, fiction, satire, cartoons and poetry published by Condé Nast...

magazine (1978) wrote of the transitions from one track to the next:

"A new sound and a new chord suddenly break in, with an effect as if one wall of a room has suddenly disappeared, to reveal a completely new view."
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