Ian C, I have to agree, I was brought up with unaccompanied singing,in our local Gaelic football club.                           i
In the 1940s and 50s we had our "big nights" around Christmas and on the odd occasion our team won a trophy.
Everyone had to sing on those happy occasions and it was all unaccompanied, we would help the shy person out by singing along, but always in those days, at street corners or on long country walks we let rip, great days, even minus the twanging Guitars. Ard Mhacha.