SUPPLEMENTARY READING
| THE RING OF THE NIBELUNG | By G. Kobbé |
| GUIDE TO THE RING OF THE NIBELUNG | By H. von Wolrogen |
| RICHARD WAGNER | By Adolphe Jullien |
| 2 Vols. Fully illustrated | |
| STUDIES IN THE WAGNERIAN DRAMA | By H. E. Krehbiel |
| RICHARD WAGNER | By W. J. Henderson |
| WAGNER AND HIS WORKS | By H. T. Finck |
| A STUDY OF WAGNER | By Ernest Newman |
| LIFE OF WAGNER | By Houston S. Chamberlain |
| Fully illustrated | |
| THE MUSIC DRAMAS OF R. WAGNER AND HIS FESTIVAL THEATER IN BAYREUTH | By Albert Lavignac |
