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In C
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In C

In C is a musical piece composed by Terry Riley in 1964. As its title suggests, it is in the key of C, the simplest key to perform on the piano. It is a response to the abstract academic serialist techniques used by composers in the mid-twentieth century.

In C consists of 53 short, numbered musical phrases; each phrase may be repeated an arbitrary number of times. Each musician has control over which phrase he or she plays: players are encouraged to play the phrases starting at different times, even if they are playing the same phrase. The rules state that the musical ensemble should try to stay within 5 or 7 phrases of each other. The phrases must be played in order, although some may be skipped. Although not noted in the score, it is customary for one musician to play the note C (in octaves) in repeated eighth notes.

In C has no set duration; performances can last as little as fifteen minutes or as long a several hours, although they average about an hour in length.