Singing
Free to read here, from Project Gutenberg.
The Psychology of Singing
How to sing [Meine Gesangskunst]
The Child-Voice in Singing
Piano and song
Observations on the Florid Song; Or, Sentiments on the Ancient and Modern Singers
Great Singers on the Art of Singing
Style in Singing
Caruso and Tetrazzini on the Art of Singing
The Voice in Singing
Advice to Singers
How to Sing
The mechanism of the human voice
Vocal Mastery
The Voice: Its Production, Care and Preservation
Voice production in singing and speaking, based on scientific principles
How to Become a Successful Singer
The Head Voice and Other Problems: Practical Talks on Singing
What Every Singer Should Know
The Renaissance of the Vocal Art
Seed Thoughts for Singers
The Boy's Voice
Melody : The Story of a Child
Caruso's method of voice production