Reger was a prolific writer of vocal works, Lieder, works for mixed chorus, men's chorus and female chorus, and extended choral works with orchestra such as "Der 100. Psalm" and "Requiem", a setting of a poem by Friedrich Hebbel, which Reger dedicated to the soldiers of World War I. He composed music to texts by poets such as Gabriele D'Annunzio, Otto Julius Bierbaum, Adelbert von Chamisso, Joseph von Eichendorff, Emanuel Geibel, Friedrich Hebbel, Nikolaus Lenau, Detlev von Liliencron, Friedrich Rückert and Ludwig Uhland. Reger assigned opus numbers to major works himself.