I've joined a Barbershop Chorus called Shannon Express to learn a bit of singing in harmony. It's a six-week course but it's preparatory to joining the group if they and I want it. I'm in the bass section for the moment.
It's quite fun singing together, the synergy of the fifty voices making quite a difference to the weedy single one that I have.
After the new recruits practised with the current members, the newbies moved away to allow the chorus of thirty or so to practise for their next gig.