Historical reference: Do not rely on this information. It is very old. About this collection
Sol-fa, from the Do, Re, Mi, Fa, Sol, etc., of the musical scale, denotes generally music or notes without text or fixed time, used merely to exercise the voice and musical knowledge in fact, the art of reading music. The chief systems are the fixed Do system, advocated by Hullah, the changeable Do system, and the Tonic Sol-fa-(q.v.).