Among the most renowned koto pieces is titled "Rokudan," or "Six Sections." It is distinctive of the danmono type of instrumental pieces comprising of various "steps," or sections, called dan. Each dan carries 104 beats and is iterated several times, with distinguished variation. A short intro of 4 to 8 beats (four beats in the instance of "Rokudan") sets out the piece, and each dan succeeds the last without a break. The first 4 beats are followed by 6 dan, each having 104 beats long. Listening to the piece once, nonetheless, could indicate that the danmono is anything but amere theme-and-variation form, as the sections are hard to differentiate. Even after hearing the piece many times, one may not be able to tell apart where a new dan starts since the melody of each dan is comprised of short figures that are normally hard to distinguish. The second and third dan are probably recognizable as associated to the first, for they’re closer to the melodious content from the first dan; afterwhich the similarity in thematic material begins to be less clear. Some fundamental melodic figures can be heard once more, but in another pan of the dan, or in another range or rhythmical pattern.
Hence, instead of trying to differentiate every section, it makes better sense to listen for the repeated short melodic figures as well as greater overall patterns. Some of the short melodic-rhythmic patterns that recur have a settling dotted figure and octave jumps. As for bigger patterns, the jo-ha-kyu construction could be employed to the
In listening to this courtly piece, we hear from the start four beats of "introduction" a long note of 2 beats followed by a coming down note a 4th away, then an interval of a 5th (ex. 8-4). This figure is easily heard throughout the piece. The accompanying beat of silence makes up the first beat of the material doubled in each dan.
A deliberate listener can hear an assortment of timbres and engaging tonal effects. Occasionally the pick of one finger slithering down the string creates a pitchless sound; sometimes glissandos sweep the strings. There might be changes in pitch that sound almost like a sliding from a note to the next and then back again. This is an effect of altering the pressure maintained in the left hand on the string when the right hand plucks it. Such soft shifting of pitch and tone color afford koto music a particular beauty.
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