In 1951, she presented the entire solo output of Mozart in a series of nine concerts (The Mozart Cycle), on original fortepianos by Michael Rosenberger (1790) and Anton Walter (1787).
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The ensemble—led by Rudolf Baumgartner and including Nikolaus and Alice Harnoncourt alongside other leading Viennese musicians—was named the Amati Orchestra, since all of the string instruments they used had been made by either members of the Amati dynasty or their students.
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A biography of Ahlgrimm, Isolde Ahlgrimm, Vienna and the early music revival, by her student, Peter Watchorn, was published by Ashgate Publishing in 2007.
Peter Watchorn: Isolde Ahlgrimm, Vienna and the early music revival (Ashgate, Burlington Vermont; Aldershot UK; 2007), ISBN 978-0-7546-5787-3