He frequently sang the tenor part in the complete recording of Bach cantatas and oratorios of Helmuth Rilling and the Gächinger Kantorei, also the Evangelist in his passions.
Bach-Collegium Stuttgart is an internationally known German instrumental ensemble, founded by Helmuth Rilling in 1965 to accompany the Gächinger Kantorei in choral music with orchestra.
Die beiden Neffen oder Der Onkel aus Boston, Kate Royal, Lothar Odinius, Carsten Süß, Gächinger Kantorei, Bach-Collegium Stuttgart, Helmut Rilling, Hänssler Classics, 2004
In 2009 the Gächinger Kantorei sang under Rilling with the New York Philharmonic Handel's Messiah in Avery Fisher Hall in New York with soloists Annette Dasch, Daniel Taylor, James Taylor and Shenyang.
In 1988, Dehning took his second sabbatical in Germany where he lectured at Munich’s Hochschule für Musik and spent time observing university and professional choruses in Munich and Stuttgart, including the Bavarian Radio Chorus and Helmuth Rilling's Gächinger Kantorei.
139 – Congratulatory and Hommage Cantatas, Helmuth Rilling, Gächinger Kantorei, Bach-Collegium Stuttgart, Christiane Oelze, Ingeborg Danz, Marcus Ullmann, Hänssler
139 – Congratulatory and Hommage Cantatas, conductor Helmuth Rilling, Gächinger Kantorei, Bach-Collegium Stuttgart, Ingeborg Danz, Marcus Ullmann, Hänssler 2000
J.S. Bach: Schäferkantate BWV 249a · Doppelkonzert nach BWV 1060, Edith Mathis, Hetty Plümacher, Theo Altmeyer, Jakob Stämpfli, Gächinger Kantorei & Figuralchor der Gedächtniskirche Stuttgart, Bach-Collegium Stuttgart, conductor Helmuth Rilling, Cantate-Musicaphon 1967
Gächinger Kantorei and Bach-Collegium Stuttgart, conducted by Rilling, completed a first recording worldwide of Bach's cantatas and oratorios, a project of 15 years in collaboration with Hänssler Classic, in 1985 on the occasion of the composer's 300th birthday.