This is quite interesting. I play in a stringband called the Euphoria Stringband. We are really a quartet, having four pieces, bass, guitar, clawhammer banjo, and fiddle. The nice thing about our group is, we all sing. We are also a mixed gender group, three men, and a woman. We don't seem to have too much difficulty arranging material, if it works, good. If we have a train wreck, then it time to reexamine what we are trying to accomplish. Sometimes we "break up" the group into a vocal duo, or a trio. And we all take turns singing the lead. The rule of thumb there is whoever brings in the new number sings lead, unless otherwise specified. Sometimes three of us play instrumental back-up to the lead singer, if that seems to work best. I guess we're pretty lucky to have four people who feel comfortable, if not confident as singers. All this lends quite a variety to the performance of the band.