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Violations of the eight precepts.
The bhikkhus in the origin story to Cv.V.36 ate at the wrong time, drank strong drink, wore garlands, scents, and cosmetics; they danced, they sang, they played instruments, they directed (§). (According to the Commentary, to Sg 13, this last word means that, "Having gotten up, floating as if in rapture, they get a dramatic dancer to dance; they give the revaka." The Sub-commentary states that revaka, which is found nowhere in the Canon and nowhere else in the Commentary, means that they demonstrated expressive or dramatic gestures (abhinaya): "Having declared their intent, 'This is how to dance,' they get up first and demonstrate the motions of the dance." The Thai translator of the Commentary suggests instead that revaka might mean the musical beat. Under either interpretation, conducting a musical performance at present would also come under this term.) They danced while a woman danced, sang while she danced, played instruments while she danced, directed while she danced. They danced ... sang ... played instruments ... directed while she sang. They danced ... sang ... played instruments ... directed while she played instruments. They danced ... sang ... played instruments ... directed while she directed... Having spread out their outer robes as a stage, they said to a dancing girl, "Dance here, sister." They applauded her (according to the Commentary, they placed their fingers first on their own foreheads, then on her forehead, saying "Good, good!" This, however, would seem to be a violation of Sg 2).
There is a dukkaṭa for going to see dancing, singing, or music.
According to the Commentary, dancing includes going to see even peacocks dancing. It also includes dancing oneself and getting others to dance. (The Roṇa Sutta — AN III.103 — notes that, in the discipline of the noble ones, dancing counts as insanity.) Singing includes drama music as well as "sādhu music," which the Commentary to Bhikkhunī Pc 10 defines as songs sung "at the time of the total Unbinding of a noble one, connected with the virtues of the Triple Gem." The Sub-commentary to Cv.V.36 defines it as music dealing with Dhamma themes such as impermanence. Other religious music would come under this prohibition as well. The Commentary adds that singing also includes singing oneself and getting others to sing. The same holds true for "playing music." (The Roṇa Sutta also notes that, in the discipline of the noble ones, singing counts as wailing.) However, there is no offense in snapping one's fingers or clapping one's hands in irritation or exasperation. There is also no offense if, within the monastery, one happens to see/hear dancing, singing, or music, but if one goes from one dwelling to another with the intention to see/hear, one incurs a dukkaṭa. The same holds true for getting up from one's seat with the intention to see/hear; or if, while standing in a road, one turns one's neck to see.