Posch, Isaac , Austrian organist, organ builder, and composer; b. place and date unknown; d. probably in Klagenfurt, c. 1622. He was active as an organist in Carinthia (from 1614) and in Carniola (from 1617). He built the organ in Oberburg for the bishops of Laibach and the organ for the Franciscan Church in Laibach in 1621. Posch publ. 2 vols., of variation suites (Regensburg, 1618, and Nuremberg, 1621), significant works in the early Baroque development of the genre. His 42 sacred concertos for 1 to 4 Voices and Basso Continuo (Nuremberg, 1623) are particularly noteworthy.
—Laura Kuhn/Dennis McIntire