Books in Opera (sorted alphabetically)
- Rhinegold & The Valkyrie Richard Wagner
- Richard Wagner, Composer of Operas John F. Runciman
- Ride of the Valkyries
- Riders to the Sea J. M. Synge
- Robbers Friedrich Schiller
- Roi s'amuse (French) Victor Hugo
- Scènes de la vie de Bohème (French) Henri Murger
- Second Book of Operas Henry Edward Krehbiel
- Sei Forse L'Angelo Fedele (Italian)
- Siegfried & The Twilight of the Gods Richard Wagner
- sogno di Scipione (Italian) Pietro Metastasio
- Some Forerunners of Italian Opera W. J. Henderson
- Song of the Lark Willa Cather
- Sorrows of Young Werther Johann Wolfgang von Goethe
- Standard Operaglass Charles Annesley
- Standard Operas: Their Plots, Their Music, and Their Composers George P. Upton
- Stories of the Wagner Opera H. A. Guerber
- Thais Anatole France
- Thaïs (French) Anatole France
- Tosca: Drame en cinq actes (French) Victorien Sardou
- Tristan and Isolda: Opera in Three Acts Richard Wagner
- Turn of the Screw Henry James
- Valkyries E. F. Benson and Richard Wagner
- Wagner's "Tristan und Isolde": An Essay on the Wagnerian Drama George Ainslie Hight
- War and Peace graf Leo Tolstoy