jam session

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

jam session

an informal gathering of musicians to play improvised music together

:
The jazz club hosts a weekly jam session.
Il jazz club ospita una jam session settimanale.
They ended up having an impromptu jam session in the living room.
Hanno finito per fare una jam session improvvisata in salotto.