The School for Clefs (Clef Studies) first appeared in 1925. A later edition appeared in 1939 that represented the full maturation of the composer's ideas. Today's new "original authentic" edition is based on that final 1939 Russian publication. It corrects errors and omissions found in previous editions which had been based on the 1925 version. It also removes all non authentic editorial content such as dynamics, articulations and tempo indications, and the original Forward by Blazhevich has been restored. Thus, in this edition, the music and text are returned to their authentic state, exactly as Blazhevich intended. As an added feature, each section of the book and many of the individual studies have been annotated by Ward Stare, principal trombonist of the Lyric Opera of Chicago.