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
Church of St Elijah, Boboshevo used to be full-length portraits of saints and a baseboard which are now destroyed. The iconostasis dates from the 17th century and is almost fully preserved. The church is an architectural monument of culture of local significance (DV is.77/1972) and an architectural-artistic monument of national importance (DV is.38/1972). The church is named after Elijah (in Bulgarian "Sveti Iliya"). Church of St Elijah, Boboshevo The Church of St Elijah () is a late Medieval Bulgarian church in the town of Boboshevo, Kyustendil Province. The church was constructed in 1687. It is located in the eastern part of Boboshevo, near the "Byalata