She studied at the Hartford Conservatory, then piano, violin (with Hugo Kortschak) and composition (with David Stanley Smith and Richard Donovan) at the Yale School of Music.
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Subsequent studies with Nadia Boulanger, Luigi Dallapiccola, Darius Milhaud, Paul Hindemith, and Philip Bezanson in composition, William Steinberg and Leonard Bernstein in conducting, and Hugo Kortschak and Ivan Galamian on violin took Yannatos to Yale University (B.M., M.M.), the University of Iowa (Ph.D.), Aspen, Tanglewood, and Paris.