An exceedingly scarce early issue of this important music theory journal. CONTENTS: thought-provoking articles on Harmony/Hearing (Boomsliter/Creel), Vicentino's Arciorgano (Kaufmann), Register (Oster), Set Styructure (Babbitt), 11th/13th Partials (Berard), Hindemith on Tonality (Briner),, and Staff notation (Cazden) [and see the accompanying scan images]. 160 pages.