| experimental music | Music challenging accepted concepts of musical sound.
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| bitonality | Two keys at the same time.
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| polytonality | More than two keys at the same time.
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| polyrhythms | Two or more simultaneous rhythmic patterns.
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| microtone | Any interval smaller than a half step.
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| tone cluster | A chord, usually of several tones, built upon seconds. Clusters are often played with the flat of the hand, the arm, or a board cut to a specified length.
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| New Music | A term used for music of an experimental nature.
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| musique concrËte (concrete music) | Music created by manipulating taped sounds.
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| twelve-tone | A technique of organizing music, developed by Arnold Schoenberg, in which all twelve tones of the octave are of equal significance.
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| gamelan | An Indonesian percussion ensemble.
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| prepared piano | A grand piano on which some or all of the strings have been “prepared” by placing foreign materials on them, thereby altering pitch, timbre, and dynamic level.
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