The think that got me singing was hearing a bloke 'marmalize' a favourite song of mine... I thought to myself...'hell, I could do better that that...' and the search for singarounds began.
I think that anyone who gets up and sings should be encouraged, ..if it is that bad... there is a reason singarounds are held in a pub..so youse can go to the bar!!
Sometimes I change key or time on purpose in order to stop an instrument accompanying me .. as I want my version unaccompanied in my style . However, If people want to join in any chorus, I will slow/follow their 'lead'. As I do not expect to get paid for my performance, I view the 'singaround' as a social event and not a concert, so if people want crib sheets/music/words then that's OK (Even Orchestras use sheet music), but it does have 'courtesy' rules though. I won't even attempt 'quiet' songs if people insist on talking through or if the overall noise level is too high as I don't get the enjoyment of singing them. Singing-out a song for the first time is fine to0, the acoustics of the bathroom are not the same as a pub, and you often find that the scan of the lines somehow changes before an audience, allowing tweaks before dragging it out again.#
Sometimes us singers have to sit through some pretty bad instrumental stuff too! -and not say a word!!! e.g. 'jazz'.............. I'll get my coat............