Warren, Ivor Singers technique : a companion to The Grammar of Singing [music] / Ivor Warren. - London : A. Hammond & Co., ©1948 - 1 vocal score (6 p.) ; music ; 31 cm. "The exercises as given, and the keys in which they are to be sung, are for sopranos and tenors. For other voices they should be transposed"--Foreword. Publisher. No.: H. 7293 Hammond Subjects--Topical Terms: Singing--Methods.Singing--Studies and exercises. Dewey Class. No.: M 783.204 / WARR