jam session

US /ˈdʒæm ˌseʃ.ən/
UK /ˈdʒæm ˌseʃ.ən/
"jam session" picture
1.

即興演奏會, 即興音樂會

an informal gathering of musicians to play improvised music together

:
The jazz club hosts a weekly jam session.
這家爵士俱樂部每週都會舉辦一次即興演奏會
They ended up having an impromptu jam session in the living room.
他們最終在客廳裡進行了一場即興的即興演奏會