Born in Hargelsberg, Kropfreiter spent his school years from 1948 at the Catholic Bischöfliches Gymnasium Petrinum, where he received his first basic musical education.
[1] Immediately after the Matura he entered the Augustiner-Chorherrenstift St. Florian in 1953, where he was initially taught music theory by Johann Krichbaum.
After completing his studies, he worked as an organist in Sankt Florian.
[4] He composed several orchestral works (among others organ concertos, 3 symphonies), masses, church music, choral music, chamber music and organ pieces[1] (among others Toccata francese, Signum, Numerous chorale arrangements of varying degrees of difficulty), with which he achieved fame not only in Austria.
In his compositions, he attached great importance to polytonality and hindemithian counterpoint.