Willi Vogel is a 3-voice canon written in F♭-major in C (common time) composed by Uli Führe.
I learned this song when auditioning to join a small mixed Bremen group [Christian, Henner, Maja, Marlene] after my time in the Collegium Musicum Bremen was amongst 15 other SATB quartet pieces they placed before me.
It is an amusing linguistic play-on-words whereby the composer William Byrd is translated to Willi Vogel. It suggests that actually William Byrd's' real name was Willi Vogel (which translates back to Willi Bird) and William Byrd sounded better. The coda of "Byrd ist hoch aufgeflogen" could mean either Byrd flew high or the reason for using a "better" name was spectacularly found out. Great stuff indeed!
It may be found in Allesimada published by Fidula-Verlag.