Seeing as I'm presently preparing several of Brahms' Eleven Choral Preludes for recital, this tune came up: "O World, Now I Must Leave Thee." It seems to be fairly uncommon; the only work I could find using the tune is a Bach four-part setting and the two Brahms preludes, #s 3 and 11.
So, seeing as I needed to come up with a harmony for my choir to sing at the recital anyway, why not, I figured, pull in the tune for a choral prelude of my own?
And this then became the Ostinato on "O Welt..." in which I borrow a page or two from Rheinberger and put the theme in the upper voices (see Meditations, Op. 167, #10), as well as have the theme constantly shifting key (Character pieces, Op. 156, #11).
So without further ado: Ostinato on, and reharmonization of, O Welt, ich muß dich lassen