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From the National Association of Teachers of Singing site:

Founded in 1944, National Association of Teachers of Singing, Inc. (NATS) is the largest professional association of teachers of singing in the world with more than 7,000 members in the United States, Canada, and more than 35 other countries. Whether working in independent studios, community schools, elementary and secondary schools, or higher education, NATS members represent the diversity of today’s music landscape, teaching in all vocal styles.

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