jam session

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

即兴演奏会, 即兴音乐会

an informal gathering of musicians to play improvised music together

:
The jazz club hosts a weekly jam session.
这家爵士俱乐部每周都会举办一次即兴演奏会
They ended up having an impromptu jam session in the living room.
他们最终在客厅里进行了一场即兴的即兴演奏会