From Book 2 of my An Art of Canon, this piece is a reimplementation in canon of Bach's harmonization of the chorale "Zeuch Zu Ein Deinen Toren," Riemenschneider No. 23. It is scored for S.A.A.B a cappella chorus, but presented here with brass and strings. Contact me at the email address listed below, for copies of this work.
The calligraphic ornament above is based on a fourteenth-century design detail appearing in Plate No. 11 of W. R. Tymms, The Art of Illuminating as Practised in Europe from the Earliest Times ... (London: Day and Son, 1860.) The roundel frames above were derived from a fifteenth-century illuminated manuscript depicting the "Vision of Isaiah" attributed to Girolamo Da Cremona, now housed in the Libreria Piccolomini, Duomo, Siena.