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TRICHORD (from the Greek. Trixordos - three-stringed) - a three-stage scale (e.g., d - e - f). In a non-halftone pentatonic. The characteristic T. consists of a whole tone and a small third (e.g., d - e - g or d - f - g) in the volume of a pure quart. In diatonic. T.'s systems usually have the meaning of small modal components (e.g., in the znamenny and other chants of other USA music). In the system of everyday scale so-called. consents are T. of a characteristic interval structure (two whole tones), playing the role of main. structural unit (see. Everyday scale, Pentatonic).