ⓘ Chinese musical system. The ancient Chinese musical system depends on very ancient mathematics used to determine sound frequencies. The easiest way to explain i ..

Chinese musical system

ⓘ Chinese musical system

The ancient Chinese musical system depends on very ancient mathematics used to determine sound frequencies. The easiest way to explain it is to work through a real example.

Suppose that somebody wanted to make a musical instrument that could play any song in the ancient Chinese system. Here are the instructions:

Make a wooden box 105 cm long and 60 cm wide. Put guides for the strings near each end of the box, and fix it so that these two guides are 99 cm apart. Multiply 99 cm by 2/3, which is 66 cm. Place a fret all the way across the box on the 66 cm line. Multiply 66 cm by 4/3, which is 88 cm. Place a fret along the 88 cm line. Multiply 88 cm by 2/3, which is 58.66.6 cm. Place a fret along this line. Multiply 58.66.6 cm by 4/3, which is 78.22.2 cm. Place a fret along this line. Multiply 78.22.2 cm by 2/3, which is 54.148148.148 cm. Place a fret along this line. Multiply 54.148148.148 cm by 4/3, which is 69.531 cm. Place a fret along this line. Multiply 69.531 cm by 2/3, which is 46.354 -- and which is too short, so double it to get 92.708 cm. Place a fret along this line. Multiply 92.708 cm by 4/3. Multiply the previous answer by 2/3. Keep going until you have put down eleven frets.

Counting the frequency on the open string and the frequencies on the fretted strings, for each string there will be 12 defined frequencies.

Tune the bottom string to some basic frequency. Tune the next string to the frequency of the bottom string at the first fret. Tune the third string to the bottom strings second fret. Keep going until you have tuned all twelve strings.

When you pluck these strings at all the fretted and unfretted positions, you will get 144 frequencies. Some of them will be duplicates, but not as many as you might think because this system is not like the Equal tempered system now used for almost all Western music.

Out of each twelve frequencies on a single string, you can make many selections of either five frequencies for the pentatonic scales or seven frequencies for the heptatonic scales.

Here is a chart showing how frequencies and scales can be produced. The frequency of 440 hertz could have been any other frequency. Once this frequency is chosen, it is multiplied by the ratios to produce the first column of frequencies. Each of these 12 frequencies is used to start its own column. See the dotted red line for one example. Any five frequencies in a column can be chosen to make a pentatonic scale, as long as they are not right together and are not more than two apart.

In the United States, students are taught the scale whose notes are named: "do, re, mi, fa, sol, la, and ti." Those seven produce a major scale. In Western music we also use a minor scale fairly frequently. But we only have those two. Chinese traditional music uses five different scales of five notes each. It also has pentatonic scales, but they are not discussed in this article.

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