Sonatas and Interludes

Sonatas and Interludes is a collection of twenty pieces for prepared piano by American avant-garde composer John Cage (1912–1992). It was composed in 1946–48, shortly after Cage's introduction to Indian philosophy and the teachings of art historian Ananda K. Coomaraswamy, both of which became major influences on the composer's later work. Significantly more complex than his other works for prepared piano,Sonatas and Interludes is generally recognized as one of Cage's finest achievements.

The cycle consists of sixteen sonatas (thirteen of which are cast in binary form, the remaining three in ternary form) and four more freely structured interludes. The aim of the pieces is to express the eight permanent emotions of the rasa Indian tradition. In Sonatas and Interludes, Cage elevated his technique of rhythmic proportions to a new level of complexity. In each sonata a short sequence of natural numbers and fractions defines the structure of the work and that of its parts, informing structures as localized as individual melodic lines.

Cage underwent an artistic crisis in the early 1940s. His compositions were rarely accepted by the public, and he grew more and more disillusioned with the idea of art as communication. He later gave an account of the reasons: "Frequently I misunderstood what another composer was saying simply because I had little understanding of his language. And I found other people misunderstanding what I myself was saying when I was saying something pointed and direct". At the beginning of 1946, Cage met Gita Sarabhai, an Indian musician who came to the United States concerned about Western influence on the music of her country. Sarabhai wanted to spend several months in the US, studying Western music. She took lessons in counterpoint and contemporary music with Cage, who offered to teach her for free if she taught him about Indian music in return. Sarabhai agreed and through her Cage became acquainted with Indian music and philosophy. The purpose of music, according to Sarabhai's teacher in India, was "to sober and quiet the mind, thus rendering it susceptible to divine influences", and this definition became one of the cornerstones of Cage's view on music and art in general.

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