Text ( visual ) : unmediated New directions in music / David H. Cope. -- 3rd ed. -- Dubuque, Iowa : W.C. Brown Co. , c1981. -- xi, 362 p. : ill., music, ports. ; 23 cm. -- Includes bibliographies and index. -- ISBN 0697034488 ; (BA6647842X) ; https://ci.nii.ac.jp/ncid/BA6647842X Author Heading(s): Cope, David. -- Classification(s): LCC : ML197 ; DC19 : 780/.904. -- Subject Heading(s): LCSH : Music -- 20th century -- History and criticism