I sang Der Herr ist mein Hirte by Max Drischner as a member of Die Zeitlupe at a memorable "Tischabendmahl" on Maundy Thursday in 2006 in Michaelskirche Bremen-Grohn. It was written in A♭ by Max Drischner and is based on Psalm 23.
As a bass singer, there is some bar-counting to do while the upper voices do their bit. For me, I loved the repeated lines
Und ob ich schon wanderte im finstern Tal on the sustained note of F - oh for the joys of works in A♭!
This choral piece can be found in Ehre und Preis page 136.