How to read music and understand it / staff notation and tonic sol-ta by the late John Curwen ; completed and edited by J. Spencer Curwen. Curwen, John, 1816-1880. Curwen, J. Spencer (John Spencer). ed. Music theory Elementary works. Tonic sol-fa. MT7.C9 H79 780.7 CUH London : J. Curwen & Sons, 1947. 1947. 1947 Text 129 p. : eng