Kelterborn studied in Basel, Detmold, Salzburg, and Zürich, among other places, with the composers Walther Geiser, Willy Burkhard, Boris Blacher, Günter Bialas, and Wolfgang Fortner. In his own teaching career, Kelterborn has served as a lecturer and professor at a number of music colleges in Germany and in Switzerland, where he directed the Basel Music Academy from 1983 to 1994. Kelterborn also headed the music division of Swiss German radio from 1974 to 1980.
Farther afield, Kelterborn has held guest lecturerships in the United States, England, Japan, China, and Eastern Europe. His works have been performed throughout Europe, the United States, and Japan, and he has also been active as a conductor on the international scene.
Kelterborn's oeuvre covers many different musical genres and includes five operas, orchestral works (some with solo instruments, voices, or electronics), chamber music, and vocal works. His four-act opera Der Kirschgarten inaugurated the newly rebuilt Zürich Opera House in 1984.
- Meyer, Thomas (2011). "Erinnerungen an eine «grüne Oper»". Dissonance, Issue 115, pp. 32-37. Swiss Association of Musicians and the Conference of Swiss Universities of Music. Retrieved 5 December 2013 (in German).
- Briner, Andreas. Rudolf Kelterborn: Komponist, Musikdenker, Vermittler. Grümlingen: Zytglogge Verlag, 1993. ISBN 3-7296-0452-X
- Kennedy, Michael (2006), The Oxford Dictionary of Music, 985 pages, ISBN 0-19-861459-4
- Larese, Dino. Rudolf Kelterborn: eine Lebensskizze. Amriswil: Amriswiler Bücherei, 1970.
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