Klaus Mertens and consistency, Klaus Mertens sang in every piece that required a bass soloist, 190 in all." He is also involved in the project Dieterich Buxtehude – Opera Omnia of the same ensemble to record the complete works of Dieterich Buxtehude, begun in 2005. As a singer of lieder, he has interpreted songs of Claudio Monteverdi, Antonio Caldara, Wolfgang Amadeus Mozart and Franz Schubert among others. He has performed the title roles of the romantic oratorios "Elijah" and "St. Paul" by Mendelssohn and, as music of the 20th century, Paul Hindemith's "Requiem" and Igor Stravinsky's "Oedipus rex". In the classical repertory
Christus. Mysterium in a Prelude and Three Oratorios Christus. Mysterium in a Prelude and Three Oratorios Christus: Ein Mysterium in einem Vorspiele und drei Oratorien is a musical composition by Felix Draeseke consisting of a prelude and three oratorios completed in September 1899. It was Felix Draeseke's most impressive accomplishment and took him over thirty years to prepare and five years to compose. It spans opus numbers 70-73. Beginning as early as the 1860s, Draeseke and his brother-in-law, the Reverend Adolf Schollmeyer, began gathering ideas for the project. According to the composer's own program notes: "Christus" was premiered in Berlin in 1912, with Bruno Kittel conducting. Later that