The Kontarskys performed Stockhausen's Mantra at the Shiraz Arts Festival, Iran on 2 September 1972. The composer at the mixing desk, foreground centre.
Aloys (14 May 1931 – 22 August 2017) and Alfons (9 October 1932 – 5 May 2010) Kontarsky were German duo-pianist brothers who were associated with a number of important world premieres of contemporary works. They had an international reputation for performing modern music for two pianists, although they also performed the standard repertoire and they sometimes played separately. They were occasionally joined by their younger brother Bernhard in performances of pieces for three pianos. After suffering a stroke in 1983, Aloys retired from performing.