Of course, prior to the introduction of melody into music (around 384 BC), all songs were sung merely on one note, and strictly unaccompanied. Surely we should all be conscientiously upholding this tradition, lest we lose a valuable part of our cultural heritage forever. The later intrusion of what we now loosely refer to as harmony into Proper Traditional music only came about through people's inability to accurately follow the tune, which was, in itself an abherration caused by the inability to maintain monophonic regularity. I hope this clears up any doubt on the matter once and for all.