I agree, (our bunch does almost all instrumentals) but you have to have at least one person that 1)CAN sing and
2)is also willing.
3)Knowing the words helps too.

I only qualify on the second one. The lady who qualifies on the first does not on the 2nd and 3rd. The gent who qualifies on the 3rd does not qualify on the 2nd. ooooo--- does that sound like lawyer-speak or what? (grin)