three-four time      
noun [ U ]  music specialized uk/θriːˈfɔː ˌtaɪm/ us/θriːˈfɔːr ˌtaɪm/ (US also three-quarter time)
 (音乐的)四三拍
a musical rhythm in which there are three crotchets (= notes of medium length) in a bar
 
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