I have played around with the guitar on and off for the last 35 or so years. OK so I should have practised more and had some lessons. I seldom use an instrument though in performance. I have had two a cappella groups in the last 10 years one with 8 of us and now one with just three. At song cicles in pubs etc. the three of us not only get listened to. I have noticed on several occasions that if people were not applauding the efforts of others, we seem to be able to draw a large round of applause as well. It is sometimes a little embarrassing when this happens after somebody else has flogged their guts out doing something instrumental or accompanied, that nobody really either noticed, or acknowledged. Young Tradition would be another group that made some sort of money through their voices.
JohnB