127, is an extended composition for organ by Max Reger, composed in 1913 and dedicated to Karl Straube who played the premiere in Breslau on 24 September.

In Karl Straube, he had an organist and friend who was able to play technically difficult music, and to influence the composition.

[7] The organist David Goode wrote that the introduction begins with dense chromaticism and flourishing figuration.

[9] The Canadian composer Healey Willan heard the work, played by his friend Dalton Baker.

When Baker said "that such a work could only have been composed by a 'German philosophical mind'" Willan was challenged to write a composition of the same structure, completed in 1916.