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English definition of “jam session”

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jam session

noun [C] uk   us  
an informal performance of jazz or rock music that the musicians have not planned or practised
Translations of “jam session”
in Chinese (Traditional) 爵士(或搖滾)音樂即興演奏會…
in Chinese (Simplified) 爵士(或摇滚)音乐即兴演奏会…
(Definition of jam session from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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