Der 100. Psalm

Der 100. Psalm
Choral composition by Max Reger
The composer at the piano, c. 1910
English	The 100th Psalm
Key	D major
Catalogue	Op. 106
Occasion	350th anniversary of the Jena University
Text	Psalm 100
Language	German
Composed	1908 (1908)–09
Dedication	Philosophical Faculty of the Jena University
Performed	31 July 1908 (1908-07-31): Leipzig (Part I) 23 February 1910 (1910-02-23): Chemnitz 23 February 1910 (1910-02-23): Breslau
Published	1916 (1916): Leipzig by Peters
Movements	4
Scoring	chorus orchestra organ

Der 100. Psalm (The 100th Psalm), Op. 106, is a composition in four movements by Max Reger in D major for mixed choir and orchestra, a late Romantic setting of Psalm 100. Reger began to compose the work in 1908 for the 350th anniversary of Jena University. The occasion was celebrated on 31 July that year with the premiere of Part I, conducted by Fritz Stein. Reger completed the composition in 1909. It was published that year and premiered on 23 February 1910 simultaneously in both Chemnitz, conducted by the composer, and in Breslau, conducted by Georg Dohrn ().

Reger structured the text in four movements, as a choral symphony. He scored it for a four-part choir with often divided voices, a large symphony orchestra and organ. He requests additional brass players for the climax in the last movement when four trumpets and four trombones play the melody of Luther's chorale "Ein feste Burg ist unser Gott". Reger used both, late-Romantic features of harmony and dynamics, and polyphony in the Baroque tradition, culminating in the final movement, a double fugue with the added instrumental cantus firmus.