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
Elijah Bashyazi a treatise on astronomy. (6) "Melitzat ha-Mitzvot" (The Precepts in Verses), imitated from the "Azharot" of Solomon ibn Gabirol. This was published in the Karaite siddur, ed. Vienna, ii. 175. Bashyazi wrote also many prayers which were embodied in the Karaite prayer-book (ed. Vienna, iii. 226). Elijah Bashyazi's great-grandson was Moses ben Elijah Bashyazi, who was also a Karaite scholar. Elijah Bashyazi Elijah ben Moses Bashyazi of Adrianople or Elijah Bašyazi (in Hebrew, Eliyahu ben Moshe ben Menahem) (c. 1420 in Adrianople – 1490 in Adrianople) was a Karaite Jewish hakham of the fifteenth century. After being instructed in the