Choirmistress, the poster Ann Burgess (06 Sep 13 - 10:45 AM) tells us that she devised the cello and harp parts herself, presumably only in English, and makes no claim of exceptional ingeniousness. If she does not turn up again, you can proclaim a Mudcat SONG CHALLENGE, for entries in ABC Notation. You should insist on C major.

It would make sense to design the whole piece for mixed choir. For example, the original timpani part would be transposed down an octave, to be sung by men. Additions for cello etc. should also be for male voices.

Why do you think that the Trommel part is by Geisler himself?