*** Tonstück – Opus 60 nr. 20, composed by Johann Georg Herzog (1822-1909).
A soft and slow Alla breve with the indication "Einleitung zu einem älteren Gesang in phrygischer Tonart". Herzog liked to paraphrase old music, often in a chorale style.
Played on the magnificent Walcker-Eule set that I use for all 21 pieces of Opus 60.
For the (almost completed) opus 60: see playlist :-)