Opera

The Development of Certain Tendencies in Modern Opera

Parsifal

Some Forerunners of Italian Opera

Great Singers, First Series

Aspects of Modern Opera: Estimates and Inquiries

A Second Book of Operas

The Standard Operaglass

Great Opera Stories

Famous Prima Donnas

Ordo Virtutum (order Of The Virtues): Full Score In Latin And English In Modern Notation With Treble Clef And Facsimile Of The Manuscript (brochure, Study Score)