jam session
US /ˈdʒæm ˌseʃ.ən/
UK /ˈdʒæm ˌseʃ.ən/
1.
an informal gathering of musicians to play improvised music together
:
•
The jazz club hosts a weekly jam session.
•
They ended up having an impromptu jam session in the living room.
an informal gathering of musicians to play improvised music together