jam session
US /ˈdʒæm ˌseʃ.ən/
UK /ˈdʒæm ˌseʃ.ən/

1.
jam session, sessão de improviso
an informal gathering of musicians to play improvised music together
:
•
The jazz club hosts a weekly jam session.
O clube de jazz organiza uma jam session semanal.
•
They ended up having an impromptu jam session in the living room.
Eles acabaram fazendo uma jam session improvisada na sala de estar.