 In 1994, Koopman embarked on a ten-year project to conduct the group in recordings and performances of the complete vocal works of Johann Sebastian Bach.His more than 200 cantatas were recorded in 22 volumes, first under the label Erato, since 2003 Challenge/Antoine Marchand Records, reissuing also the former volumes.Soloists for this project included sopranos Els Bongers, Ruth Holton, Lisa Larsson, Marlis Petersen, Sandrine Piau, Dorothea Röschmann, Sibylla Rubens, Barbara Schlick, Caroline Stam (a member of the choir from the beginning), Deborah York, Ruth Ziesak and Johannette Zomer, altos Bogna Bartosz, Michael Chance, Franziska Gottwald, Bernhard Landauer, Elisabeth von Magnus, Annette Markert, Andreas Scholl, Nathalie Stutzmann and Kai Wessel, tenors Paul Agnew, Jörg Dürmüller, James Gilchrist, Guy de Mey, Christoph Prégardien and Gerd Türk, and bass Klaus Mertens.