Carl Czerny, his name still known to student pianists, was born in 1791, the year of Mozart’s death, and his many transcriptions for the piano of works by Beethoven, Mozart and others include a version of Mozart’s Requiem in which the orchestra is replaced by piano duet. Complementing this is a transcription of Mozart’s Ave verum for the same forces by the Italian composer and pianist Domenico Clapasson. Miserere is a setting of verses from Psalm 50 made by Mozart during his stay in Bologna in 1770, when he studied Palestrina’s counterpoint with Padre Martini. The verses are sung in alternation with the traditional plainchant.