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Phrygian Gates

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Phrygian Gates is a piano piece written by minimalist composer John Coolidge Adams in 1977-1978.

The piece, together with its smaller companion China Gates is what is considered Adams' "opus one". They are, according to his own claims, his first compositions consisting of a coherent personal style. It was commissioned and written for the pianist Mack Mccray, and first performed by him in Hellman Hall, San Francisco.

The piece is written in a minimalist style, and based on a repetitive cell structure. Simultaneously, Adams' desire to move away from the conventional techniques of minimalism is noticeable. The composition is set in the Phrygian mode, and cycles through half the keys throughout its roughly 30 minute duration, modulating in the circle of fifths. As claimed by Adams, it is "in the form of a modulating square wave with one state in the Lydian mode and the other in the Phrygian mode". Gradually, the amount of time spent in the Lydian shortens and shifts more to the Phrygian. The "Gates" in the title is an allusion from the electronic music gates, a term for rapidly shifting modes.