A Complete Treatise on the Art of Singing, Part One: Manel Garcia, by Manuel Garcia II. First Part, Complete and Unabridged, The Editions of 1841 and 1872 collated, edited, and translated by Donald V. Paschke.
Manuel García (1775-1832): Chronicle of the Life of a bel canto Tenor at the Dawn of Romanticism, James Radomski. A biography of the founder of the García Method. Currently, it is out of print: find it in a library.
Bel Canto: A History of Vocal Pedagogy, James Stark is a well-written and researched overview of classical voice training.
Beyond Talent: Creating a Successful Career in Music, Angela Myles Beeching. This is essential information for those who want to sing professionally.
The War of Art; The Artist’s Journey, Steven Pressfield. Required reading for creatives.

CS-Music—audition information via Classical Singer Magazine.
Opera Arias Database —a resource for operatic roles and arias.
The Aria Database — another resource for operatic roles and arias.
Aria PDF Database —database with links to Classical Vocal Reprints.
The Lied, Art Song, and Choral Texts Archive —translation and information of art song texts.
Art Song Transpositions: Art Songs and Arias in Any Key
IPA Source —detailed information on language pronunciation and diction.
RussianIPA —an excellent source for IPA, translation, and coaching of Russian repertoire.
Classical Vocal Reprints —an excellent resource for hard-to-find songs and scores.

Musical's 101 —comprehensive information about the American Musical Theatre.
Broadwayworld.com —colleges that offer Musical Theatre degrees.
Stage Agent —a database containing information on casting and roles.
Playbill —current productions and casting.
Contemporary Musical Theatre —musicals written between 2000-2015. Listed by category (legit, contemporary mix, pop/rock, world music, etc).
Musical Theatre Songs —repertoire database, monthly/yearly membership.

Serenades Choral Travel —Choral ensemble founded by Paulo Faustini.
American Choral Directors Association —professional organization for choral conductors.
ChoralNet —networking site for the global choral community.
Chorus America Singer Network —website for the American choral community.

Classical Vocal Reprints —highly recommended source for classical music.
CD Sheet Music —classical sheet music.
Score Exchange —digital sheet music.
Sheet Music Plus —standards and contemporary music by key.
Music Notes —standards and contemporary music.
Historic American Sheet Music —songs in the public domain.
Sheet Music Consortium —provides access to 22 collections and archives.
Petrucci Music Library —scores and songs in the public domain.
African American Sheet Music —a digital sheet music collection at Brown University.
Virtual Sheet Music —classical, jazz, and traditional music.
Online Sheet Music —easy-to-use sheet music.

Musictheory.net —what every singer needs to know.
Neil Hawe’s “Learn to SightSing” website —expand your sight-reading skills using this site.
Musical Terms —know your terms and the score.
Sight-singing with Liz Fleischer —New York City-based instruction re-sight-singing.
Sight Reading Factory—sight reading and sight singing practice.

Beckedorf, Dirk; Franz Müller, “Enrico Caruso, Alfred Tomatis, and modern neurobiology: prosocial listening, steady heartbeat , and successful communication,” Swiss Journal of Integrative Medicine 2014; 26: 156 –161.
Doidge, Norman. The Brain's Way of Healing: Remarkable Discoveries from the Frontiers of Neuroplasticity, 2015. Chapter 8 features the work of Paul Madaule at the Listening Centre in Toronto, Canada.
Hurley, Susan. Singers and Sound: An Introduction to Tomatis-Based Listening Training, 2012. Hurley's doctoral dissertation pulls together the many strands of research on Tomatis' method and its effectiveness regarding singing.
Madaule, Paul. The Listening Centre, Toronto, Canada; "Listening and Singing," Journal of Singing, May/June 2001; "The Tomatis Method for Singers and Musicians," An excerpt from About the Tomatis Method; Madaule, Paul. When Listening Comes Alive, 1994; Ebook.
Stillitano, Carmela. "The Effects of the Tomatis Method on the Artistic Voice," International Journal of Listening, 2016.
Tomatis, Alfred A. The Conscious Ear, 1992; The Ear and Language, 1997; The Ear and the Voice: translated by Roberta Prada, Pierre Sollier, and Francis Keeping, 2004.

American Guild of Musical Artists: union for professional singers, dancers, stage managers, and directors.
National Association of Teachers of Singing: publishes the Journal of Singing and was incorporated in 1944.
New York Singing Teachers Association: publishes VOICEPrints and was incorporated in 1906.
The SpeakEasy Cooperative: for independent voice studio owners.