Following Martinon, http://www.colinscolumn.com/three-pieces-of-music-by-jean-martinon-overture-concerto-symphony-audio-of-each/, and Klemperer, http://www.colinscolumn.com/conductor-composers-2-otto-klemperers-merry-waltz-the-composer-conducts-the-philharmonia-orchestra-1962-columbia-recording/, here is an example of Kubelík’s own music, which has me in mind of Karl Amadeus Hartmann.
Conductor-composers/3: Rafael Kubelík (1914-96) conducts his Symphony in One Movement (1974) with [sic] Cologne Radio Orchestra [audio only].
Eloquence has recently released two sets devoted to Kubelík’s conducting art:
https://www.eloquenceclassics.com/releases/rafael-kubelik-the-mercury-masters/
https://www.eloquenceclassics.com/releases/rafael-kubelik-complete-decca-recordings/