Steve Reich completed Music for 18 Musicians in 1976. The ensemble is unusual: four pianos, three marimbas, two xylophones, vibraphone, violin, cello, clarinets and four female voices. Reich noted that although the steady pulse connects the piece to his earlier work, its harmony, instrumentation and structure represented something new. All the sound is acoustic, with microphones used only for amplification.
What fascinates me is how mechanical the music can seem without actually being mechanical. Patterns repeat with extraordinary precision, yet changes are passed through human cues, breath and attention. Voices and clarinets have to breathe. Percussionists physically repeat figures. Small harmonic shifts gradually alter what the listener notices inside the pulse.
Minimalism is sometimes described as music where very little happens. Music for 18 Musicians makes me hear the opposite. So much happens that the changes can become almost microscopic. Repetition magnifies difference.
A machine could reproduce a loop perfectly. Eighteen musicians make the loop interesting because perfect repetition is never quite possible.
https://www.boosey.com/cr/music/Steve-Reich-Music-for-18-Musicians/548
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