When the Güntherschule was destroyed in an Allied air raid in 1945, Keetman and the other stakeholders of the school were at a loss; the small musical home they had created was now destroyed. Keetman reflected:

    We had our recorders with us; we could not do anything but make music together. At that moment, we played out our entire misery and sadness. I believe that when we finally stopped playing, we had played ourselves a little courage. (Sitzman, 2005, pg. 18).

    With the destruction of the school, Orff, Günther, and Keetman faced the grim reality that Orff-Schulwerk and the Güntherschule had come to an end. Fortuitously, that was not to be the case. In 1948, Annemarie Shambeck (a German Administrator) came across a recording of the Güntherschule children's choir performing at the opening of the 1936 Summer Olympics in Berlin and asked Orff to translate the Güntherschule works for younger children (Feierabend et al., 2018). The result was the Bavarian Radio broadcasts. Taught by Keetman, the weekly broadcast to thousands of school-aged children created such a surge in interest for the Schulwerk, the repertoire and instruments used. So much so in 1949, Orff asked his friend and engineer Klaus Beker-Ehiem to create better instruments needed for the broadcasts and for the rigors of daily use in schools.

    Because of these events, Keetman oriented her new compositions to a significantly younger audience (Thresher, 1964). Consequently, by taking the ideas and methods gleaned from years at the Güntherschule and applying them to music and movement education for younger children, she started a movement for educational reform. Higher learning administrators at the time were not very keen on Keetman's forward-thinking ideas, but she persisted. These events eventually cemented the Orff-Schulwerk process in Germany. In 1949, she took a teaching position at the Mozarteum in Salzburg, Austria. Her teaching of Orff-Schulwerk led to the training of 1,000's of teachers over her tenure, and eventually led to the creation of the Orff Institute, which remains to this day.