I basically sing for an audience (of one or more makes little if any difference). Yes, I can and do often sing for myself, without an audience. BUT. . . .

In my solitude, the idea of an audience is there, the prospect of an audience. If I had known in my late teens, when I started with guitar and singing folk songs, that I would never have an audience, I doubt that I'd have bothered. Today, after 55 years of learning and writing songs, of singing for myself and for others, if I knew that there would never again be an audience, it's doubtful that I would maintain an interest.   

Dave Oesterreich