Chapter Sixteen: Musical Pitch — Ruibin and the Sound of the Summer Solstice

I. The Twelve Pitch-Pipes and the Twelve Months

In the system of musical pitch, the Summer Solstice corresponds to Ruibin (蕤宾), one of the twelve pitch-pipes. To understand this correspondence, one must first appreciate the profound ancient concept of "pitch-pipes and calendar in mutual accord."

The twelve months are matched to the twelve pitch-pipes (shier lulü): Huangzhong (eleventh month), Dalü (twelfth month), Taicu (first month), Jiazhong (second month), Guxian (third month), Zhonglü (fourth month), Ruibin (fifth month), Linzhong (sixth month), Yize (seventh month), Nanlü (eighth month), Wuyi (ninth month), Yingzhong (tenth month).

The fifth month of the Summer Solstice corresponds to Ruibin. The Monthly Ordinances explicitly states: "The pitch-pipe in accord is Ruibin." The underlying belief is that the vibrations of cosmic energy in each month resonate with the sound produced by a specific pitch-pipe. The ancestors even devised a method of "testing the energies" (houqi): placing twelve pitch-pipes in a sealed chamber, each filled with reed-membrane ash. When the corresponding month arrived, the ash in the corresponding pipe would spontaneously fly out — because that month's cosmic energy resonated with that pitch-pipe, agitating the ash within. A wondrous conception, fusing pitch, solar terms, and cosmic energy into a single vibrating whole.

II. The Deep Meaning of the Name Ruibin

The name Ruibin itself harbors meaning aligned with the Summer Solstice's Way of Heaven. Rui (蕤) carries connotations of luxuriance, drooping profusion, and the fullness of vegetation (as in weirui, "lushly luxuriant"); bin (宾) carries connotations of "welcoming," "guest," "receiving with respect."

Reading Ruibin together in light of "one yin arising at the Summer Solstice": rui captures the supreme luxuriance of yang at its extreme (the Summer Solstice, when all things flourish); bin captures the respectful welcoming of nascent yin. Yang is still vigorous (rui), yet already begins to receive the nascent yin with the courtesy due a guest (bin). Is this not the most exquisite musical expression of "one yin arising at the Summer Solstice"$16

III. The Zhi Note, Ruibin, and the Sound of Fire Virtue

The Summer Solstice's musical dimension operates on two levels: from the five tones, midsummer's tone is zhi (soaring, ardent, matching fire's passion); from the twelve pitch-pipes, the fifth month's pipe is Ruibin. The two are complementary: zhi speaks to the sonic character (ardent fire-virtue sound at its extreme), while Ruibin speaks to the calendrical position (the fifth-month pitch, the station of yang's extreme and yin's nascence). This fire-virtue sound, at its most exalted pitch (zhi, cicada-song), is precisely the threshold beyond which it must begin descending — just as cicada-song, though at its peak, already conceals the first whisper of the autumn cicada's plaintive cry.

IV. The Way of Heaven in Music: A Musical Theory of Knowing Decline Within Fullness

Chinese musical theory places supreme value on "centrality and harmony" (zhonghe) and opposes excess. The Record of Rites ("Record of Music") says: "Music is the harmony of Heaven and Earth." The Summer Solstice's music (zhi note, Ruibin) is the Way of Heaven's "sound" reaching its most magnificent — yet it must never become "excessive." The meaning of "welcoming nascent yin" embedded in the name Ruibin injects the wisdom of "knowing decline" and "restraint" into this grand fire-virtue sound: even at its most soaring and magnificent, one must bear in mind the clarity of "welcoming the reversal."

Thus the Summer Solstice's music — the soaring zhi note, Ruibin's "fullness welcoming yin" — achieves perfect unity with the cosmic truth explored throughout this essay. Whether in astronomy (the sun at its northernmost, about to return south), phenology (deer shed antlers, cicada-song supreme yet containing the whisper of autumn), hexagram symbolism (Qian at its extreme, Gou arises), ritual (sacrifice to Earth to welcome nascent yin), or music (Ruibin welcoming the reversal) — all of the Summer Solstice repeatedly tells the same truth: the full extreme inevitably reverses; yang at its peak, yin is born. Within the most exalted "sound" the cosmic energy emits at the Summer Solstice, the "message" of its inevitable turning toward the subdued already lies concealed.