Recall that the Markov Chain Drunkard’s Walk algorithm is one where the next step is either to left or right in a sequence. In this case, I’ve applied it to the Rock of Ages Hymn. The preprocessor chooses to start with one of the many chords in the hymn, and goes either forward to the next chord in the sequence or back one. Repeat for a while. This was hard to do, but I think the effect is interesting. I might try to use it more, now that I finally figured out how to code it.
Or download here: Rock of Ages, Cleft for Me.