The John Mehegan reference article from the English Wikipedia on 24-Apr-2004
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John Mehegan

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John Mehegan was a jazz pianist, lecturer and critic.

He was born in Hartford, Connecticut, and began playing the piano at the age of five. In 1946 he was appointed head of the jazz department at the Metropolitan Music School in New York. He later held posts at the Juilliard School of Music and Yale University.

He authored numerous books in jazz, including the Jazz Improvisation series, which sets out the basic principles of jazz.