There's a bar in Toronto where people gather twice a week to form a choir and render pop classics.
They practice arrangements then jam out their finished version.
They have attracted big names like Rick Ashley and Colin Hay [Men at work]
and have expanded to larger venues and different guest cities.
There's something profound at the heart of collective voices.
Something larger than aural mathematics which on the face of it is all music is.
I find it all very attractive and easily modular. I'd jump at the opportunity to participate in musical cells such as these.
You need a couple of competent musicians and someone proficient at designing vocal arrangements.
Here's some examples.
Art unites. Art creates empathy.