I have been singing all my life, mostly folk, and have worked really hard at it. I definitely consider my voice an instrument and look after it really carefully. Just think of the work that goes into producing a good performance. Obviously get the tune and the words right, but there's appropriate phrasing and articulation, which will be vary greatly for different types of song and timing is vital. You must watch the audience carefully to see how well you're doing, which may mean a swift change of presentation if you sense you're not connecting with them. Also, if you're being accompanied there's real teamwork and co-operation involved. All performers have to develop a rapport with their audience and that goes for singers as well as musicians. And lastly, who dared to compare my voice to a triangle!