WaV - Whilst it's fine to sing or play monophonically, and only perform a self-imposed limited range of material, the greater majority of people would find that unentertaining. A large proportion of musicians and singers wouldn't enjoy doing it. Many of us like harmony and texture, and we much prefer our audiences to be entertained, happy, and wanting more. Most performers like to eat as well. Folk music would die. It has to entertain enough people to maintain its existence. It has to be done in a way that a contemporary audience can derive some pleasure from, otherwise it doesn't get propagated. You play, sing and listen to what you like - we'll do the same. Live with it.