In my group, there is a man with a lovely voice- but it's overwhelmed by instruments or even most harmonies. So we have learned just to back off when he sings. It's kind of a nice change, for that matter, since he tends to sing mostly old ballads.

The other thing that helps is to be aware of what key or range you can sing powerfully in. My friend has a fairly narrow range- he sings mostly in F- but we have worked at finding songs for him in other keys, and it's working.

Ebbie