The band I am in, we work on our vocal harmonies, just as much as our instrumental prowless.
The bassist is a great backup vocalist, the drummer is good too, the rhythm guitarist / keyboardist ( Emerson/ Wakeman virtuoso) has a good voice too and I'm not to shabby either.
We cover everything from 60's Classic Rock, Metal, Thrash, Blues an 70's Progressive Rock.
Just try to be patient with them, if not, network and find others to play with .