Chapter Fourteen: Musical Tuning -- The Sound of Jiazhong and the Harmony of Heaven and Earth

I. The Twelve Pitch-Pipes and the Twelve Months: A Cosmology of Unified Music and Calendar

In ancient China, musical tuning was far more than a matter of music alone -- it bore profound connections to the calendar, the solar terms, and the operation of the cosmos. This is the principle known as "the unity of pitch-pipes and calendar" (lu li he yi) -- musical pitch and calendrical reckoning are one; both are manifestations of the rhythmic operation of the qi of heaven and earth.

Specifically, the ancients divided the musical scale into twelve pitch-pipes (lu): Huangzhong, Dalv, Taicu, Jiazhong, Guxian, Zhonglv, Ruibin, Linzhong, Yize, Nanlv, Wuyi, Yingzhong. These twelve pitch-pipes correspond to the twelve months of the year: Huangzhong to the eleventh month (Zi), Dalv to the twelfth month (Chou), Taicu to the first month (Yin), Jiazhong to the second month (Mao), and so on through the cycle.

The second month (Month of Mao) in which Jingzhe falls corresponds to "Jiazhong" among the twelve pitch-pipes. That is, from the perspective of musical tuning, the "sound" of the Jingzhe season is the Jiazhong tone.

Why can musical pitch correspond to the months$1 Behind this lies a profoundly deep cosmology: the waxing and waning of heaven and earth's qi over the year is rhythmic, possessed of a "beat." Musical pitch is the sonic expression of this cosmic rhythm. Each month's qi of heaven and earth has its particular "frequency," and this frequency corresponds to one of the twelve pitch-pipes. In other words, the ancients believed that the operation of heaven and earth's qi was itself a grand "musical composition," and the twelve pitch-pipes were its twelve notes.

II. The Name "Jiazhong": Assisting All Things, Gathering Yang Qi

The name "Jiazhong" itself carries deep meaning worthy of careful reflection.

"Jia" has the sense of flanking, assisting, supporting; "zhong" has the sense of gathering, collecting, concentrating (and is also cognate with "zhong," meaning to plant, to gestate). The ancients' naming of the twelve pitch-pipes often embedded their understanding of the state of heaven and earth's qi in that month. Regarding "Jiazhong," the Records of the Grand Historian (Shiji), "Treatise on the Pitch-Pipes," and the Book of Han (Hanshu), "Treatise on Pitch-Pipes and the Calendar," offer explanations to the effect that: by the second month, yang qi is flanking and assisting all things in their generation, enabling dormant life to stir and grow. The "jia" of "Jiazhong" describes yang qi's action of flanking, supporting, and assisting all things as they burst through the bonds of yin qi and surge forth.

How perfectly this accords with the theme of Jingzhe! Jingzhe is precisely the season when yang qi surges, flanking and assisting all things as they break through the gloom, awakening and growing. The sound of "Jiazhong" is the sonic expression of this "yang qi flanking and assisting the generation of all things." When we say that Jingzhe's "sound" is Jiazhong, we mean: the rhythm of heaven and earth's qi at Jingzhe -- surging, assisting, generative -- resonates precisely with the frequency of the Jiazhong pitch-pipe.

Going deeper, "Jiazhong," assigned to the second month, sits between Taicu (first month) and Guxian (third month). From Huangzhong (eleventh month, yang qi first born) through Dalv and Taicu to Jiazhong, yang qi has grown steadily. The position of "Jiazhong" is precisely the critical node at which yang qi has grown strong enough to "flank and assist" the full-scale generation of all things -- fully consistent with the second month's Dazhuang hexagram (four yang lines ascendant) in the Twelve Waxing-and-Waning Hexagrams. Pitch-pipe and hexagram, from different perspectives (sound and number-image), together fix the essence of Jingzhe: "yang qi ascendant, flanking and assisting all things."

III. The Theory of "Testing the Qi": The Qi of Heaven and Earth in the Pitch-Pipes

The ancients had an extraordinary practice related to "the unity of pitch-pipes and calendar" called "testing the qi" (hou qi).

In this practice, the ancients believed that if pitch-pipes corresponding to the twelve months were buried in a sealed chamber in a particular manner, with the ash of burned reed membranes (jiafu zhi hui, "catkin ash") placed inside each pipe, then when heaven and earth's qi arrived at a given month, the ash in the pitch-pipe corresponding to that month would be blown out by the "qi." For example, at the winter solstice (eleventh month), the ash in the Huangzhong pipe would stir; at Jingzhe's second month, the ash in the Jiazhong pipe would stir.

This "testing the qi" theory, from today's perspective, lacks scientific foundation and is difficult to reproduce. Yet the conception it reflects is profoundly significant: the ancients believed that heaven and earth's qi was real, flowing, and rhythmic, and that this rhythmic qi could be "sensed" and "measured" through pitch-pipe "instruments." In their imagination, the qi of heaven and earth and the qi of musical pitch were the same thing -- when the qi moved to the second month, it would resonate with the Jiazhong pipe and blow out its ash. This was a grand conception unifying astronomy, calendar, music, and even physical experimentation.

Whether or not the testing of qi could actually work, it vividly embodies the core conviction of Chinese antiquity: the cosmos is an organic whole filled with rhythm and mutual responsiveness. The qi above, the things below, the ash in the pipe, the sound in the ear -- all are penetrated by one and the same "qi." Jingzhe's correspondence with Jiazhong is not an abstract assignment but, in the ancients' eyes, a living, "testable," "sensible" cosmic rhythm.

IV. The Jue Note and Jiazhong: The Two Dimensions of Jingzhe's Sound

We have now encountered two dimensions of Jingzhe in musical tuning: from the perspective of the five notes (gong, shang, jue, zhi, yu), the spring season of Jingzhe corresponds to "jue" (see Chapter Four); from the perspective of the twelve pitch-pipes, Jingzhe's second month corresponds to "Jiazhong." What is the relationship between these two$2

The five notes are assigned from the framework of the "Five Phases": jue = Wood = spring; zhi = Fire = summer; gong = Earth = late summer; shang = Metal = autumn; yu = Water = winter. This fixes the general sonic character of Jingzhe as "spring" and "the virtue of Wood" -- the jue tone is clear and rising, like branches stretching upward, vitality bursting forth.

The twelve pitch-pipes are assigned from the framework of the "twelve months," more finely grained than the five notes: each month receives one pitch-pipe. Jiazhong is assigned to the second month, fixing the sonic character of Jingzhe as the specific period of "mid-spring, second month" -- the qi of Jiazhong, flanking and assisting all things in their generation.

Viewed together, Jingzhe's sound achieves a complete portrait: broadly, it belongs to "jue" (Wood, spring, generation, rising); specifically, it belongs to "Jiazhong" (second month, yang qi flanking and assisting all things). One fixes its "kind" (the Wood of spring), the other its "position" (mid-spring, second month). These two dimensions together compose the precise coordinates of Jingzhe within the music of heaven and earth.

From this we can appreciate how three-dimensional and subtle the ancients' understanding of the solar terms was. They grasped Jingzhe not only through astronomy (ecliptic longitude, stellar phenomena), phenology (peach blossoms, orioles), hexagram imagery (Zhen, Dazhuang), and the Five Phases (the virtue of Wood), but also through musical tuning (jue, Jiazhong). In their cosmos, Jingzhe was not merely visible (blazing peach blossoms) and palpable (the crash of spring thunder) but audible (the sound of Jiazhong). When heaven and earth's qi reached Jingzhe, it played a "Jiazhong" melody -- what a poetic and profound cosmic imagination!