This version of Hamlet Improvisation http://www.last.fm/music/Miloslav+Kabel%C3%A1%C4%8D/Improvisaci%C3%B3n+sobre+Hamlet%2C+Invenci%C3%B3nes+para+percusi%C3%B3n (but i don´t know who plays it) is awesome - deeply submerged, tragic, but with strong force of mind. I must admit it is better than the version of Karel Ančerl (http://www.last.fm/music/Miloslav+Kabel%C3%A1%C4%8D/Mystery+of+Time%2C+Hamlet+Improvisation+%28Czech+Philharmonic+Orchestra%2C+Karel+An%C4%8Derl%29), however Mystery of Time by him is absolutely great .
Kahanek in the 8 préludes: such deep, massive, granitic music. Very modern too, almost homophonic at times with those huge, low chords doing little but providing a backdrop for the development in the other hand, roles which he even sometimes inverses by giving the chord progression proeminence over a curtain of ostinato-like motifs. Quite a contrast after the godly Janacek sonata, but then it's such a fitting followup at the same time.