His successor Ralf Otto expanded the repertoire, especially by rarely performed contemporary music, and made the group known internationally.
He conducted the group for 30 years, initiating a series of weekly Bach cantatas in collaboration with the broadcaster.
The choir worked with conductors such as Eliahu Inbal, Michael Gielen, Enoch zu Guttenberg, Péter Eötvös, Georges Prêtre, Peter Schreier, Ádám Fischer, Sylvain Cambreling, Riccardo Chailly and Philippe Jordan.
The Bachchor Mainz has performed regularly on tours in Germany and abroad, including France, Israel, Poland, Spain, and South America.
In October 2018, the Bachchor Mainz performed the world premiere Gerhard Müller-Hornbach oratorio Im Spiegel der Angst, a commission of the Protestant Church in Hesse and Nassau on the occasion of 500 years Reformation in 2017.