Question: Klaudia Taev, was an Estonian Vocal pedagogue, vocal pedagogy is the study of the art and science of voice instruction, it is used in the teaching of what?

Context paragraphs:
Donald Bell: Donald Bell (born 19 June 1934) is a Canadian bass-baritone and vocal pedagogue.  For over four decades he actively performed in concerts and operas internationally.  He retired from performance in 1994.  As a vocal pedagogue he has researched and published studies on vocal acoustics and laryngeal function.  He is the founder of the Vocal Arts Acoustical Research Group at the University of Calgary where he currently serves on the voice faculty.

Sport pedagogy: Sport Pedagogy is the academic field of study, which is located at the intersection between sport and education.  As a discipline, sport pedagogy is concerned with learning, teaching and instruction in sport, physical education and related areas of physical activity.  Whilst sport pedagogy is mostly regarded as a sub-discipline of sport science (in North America frequently referred to as kinesiology), its theoretical grounding is also underpinned by the general education sciences.  As a scientific subdiscipline sport pedagogy is therefore allied to both fields, sport science and education.

Klaudia Taev: Klaudia Taev (13 April 1906, Saaremaa - 7 June 1985, Pärnu) was an Estonian Vocal pedagogue.

Oren Brown: Oren Brown (April 13, 1909 – March 6, 2004) was a well-known and highly successful American vocal pedagogue and voice teacher.

Klaudia Taev Competition: The Klaudia Taev Competition is a competition for young opera singers.  It is a main event of the Pärnu Opera Music Festival PromFest.  The Competition has been named after a local legendary singing teacher Klaudia Taev.  The first Competition was held in year 1996 and since 2001 it takes place biannually.

Lee Snook: Dr. Lee Erin Snook, Associate Professor, baritone, is chair of the Vocal Division at Washburn University in Topeka, Kansas.  He teaches Studio Voice, Vocal Pedagogy, and Enjoyment of Music.  Snook holds a Doctor of Musical Arts in Voice Performance degree from Michigan State University.  He joined the Washburn University Music Department faculty in 1990.

William Vennard: William Vennard (31 January 1909 Normal, Illinois – 10 January 1971 Los Angeles, California) was a famous American vocal pedagogist who devoted his life to researching the human voice and its use in singing.  He was one of the driving forces behind a major shift within the field of vocal pedagogy during the middle of the 20th century.  Along with a few other American singing teachers, such as Ralph Appelman at Indiana University, Vennard introduced contemporary scientific research in the areas of human anatomy and physiology into the study of singing.  This shift in approach led to the rejection of many of the beliefs and practices held since the bel canto era, most particularly in the areas of vocal registration and vocal resonation.  Vennard was renowned as an excellent teacher whose written works have influenced generations of singers, vocal pedagogues and voice scientists.  He taught many successful singers including acclaimed mezzo-soprano Marilyn Horne, who studied under him at the University of Southern California.

Vocal pedagogy: Vocal pedagogy is the study of the art and science of voice instruction.  It is used in the teaching of singing and assists in defining what singing is, how singing works, and how proper singing technique is accomplished.

Piano pedagogy: Piano pedagogy is the study of the teaching of piano playing.  Whereas the professional field of music education pertains to the teaching of music in school classrooms or group settings, piano pedagogy focuses on the teaching of musical skills to individual piano students.  This is often done via private or semiprivate instructions, commonly referred to as piano lessons.  The practitioners of piano pedagogy are called piano pedagogues, or simply, piano teachers.

Head voice: In vocal music, the head voice, depending on vocal pedagogy, is a particular part of the vocal range, or type of vocal register, or a vocal resonance area.

Supporting paragraphs: Klaudia Taev Vocal pedagogy
Answer: singing