Nun jauchzt dem Herren alle Welt

Oskar Gottlieb Blarr (* 6 May 1934) is a German composer, organist, church musician and academic teacher.

Blarr was born in Sandlack near Bartenstein (East Prussia). The Gothic church with its Baroque organ fascinated him early on; he began to form a lifelong love for organs. Blarr and his family fled to West Germany in 1945. He wrote his first compositions at age 12. He studied church music from 1952 at the Kirchenmusikschule in Hannover, percussion at the Musikhochschule Hannover, and composition with Heinrich Spitta. He continued his studies, conducting with Dean Dixon and Herbert von Karajan in Salzburg, composition with Bernd Alois Zimmermann in Cologne, Krzysztof Penderecki at the Folkwang-Hochschule in Essen, and Milko Kelemen and Günther Becker at the Robert Schumann Hochschule in Düsseldorf. He was church musician at the Neanderkirche in Düsseldorf from 1961 to 1999.

Blarr composed four oratorios about the life of Jesus, four symphonies, chamber music and works for organ. He also set many songs of the genre Neues Geistliches Lied to music, some of under the pseudonym Choral Brother Ogo.

Published by Breitkopf & Härtel in "In Ewigkeit dich loben", Vol. 3.