Noun, Suru verb, Noun which may take the genitive case particle 'no'
1. singing or chanting in unison
Wikipedia definition
2. UnisonIn music, the word unison can be applied in more than one way. In general terms, it may refer to two notes sounding the same pitch, often but not always at the same time; or to the same musical voice being sounded by several voices or instruments together, either at the same pitch or at a distance of one or more octaves; or to rhythmic patterns which are homorhythmic.
Read “Unison” on English Wikipedia
Read “斉唱” on Japanese Wikipedia
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