Edited by Robert Benton.  This volume contains thirty vocalise-etudes by various composers, originally commissioned by Paris Conservatory voice teacher A.L. Hettich.  The pieces in this volume were published in collections dating from 1907, 1909 and 1920, and include music by Faure, Koechlin, Ropartz, Vierne, Hahn, Ravel, and many others.  With an introduction.  The CD contains PDF scores.  Spiral bound book, 55 p. with CD.