From Wikipedia:
Petr Eben (22 January 1929 – 24 October 2007) was a Czech composer of modern and contemporary classical music, organist and choirmaster.
Eben was considered a master at improvisation on the organ and piano, but composition remained his main area of interest. His music has been widely performed and recorded since about 1980, with his popularity still apparently on the rise. Stylistically, his musical language can be considered as "neoexpressionistic" in many ways, however in some works we can hear some kind of new forms of impressionistic tendencies. He is usually compared with Olivier Messiaen (and there is relatively frequent combination of those two composers in organists recitals and on discs), but in other than organ works remains less experimental.