Swiss musician and composer Rudolf Kelterborn passed away on March 24, 2021 in his hometown of Basel, Switzerland. He was 89. Kelterborn was born on September 3, 1931 and would go on to study in Basel, Detmolo, Salzburg, and Zurich, among others, with such composers Walther Geiser, Willy Burtfhard, Günter Bialas, and Wolfgang Fortner. Throughout his long career, he served {…}