Iannis Xenakis - Metastasis
The sounds being used are orchestral, mostly stringed instruments and bells. What Xenakis is experimenting with is changing over time, but the piece creates tension, and it is difficult to anticipate what is coming next. The overall pitch rises and falls, and sustained pitches are common. He also uses pizzicato, providing the plucking sounds. It feels chaotic as a nontraditional musical piece, as a result it creates tension, along with the sliding rises and falls at the beginning and end. I would characterize the work as art, because it uses contemporary musical instruments/sounds, as well as music, because it is experimenting with musical theory.
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