 Mendelssohn played the organ and composed for it from the age of 11 to his death . His primary organ works are the Three Preludes and Fugues , Op. 37 ( 1837 ) , and the Six Sonatas , Op. 65 ( 1845 ) , of which Eric Werner wrote " next to Bach 's works , Mendelssohn 's Organ Sonatas belong to the required repertory of all organists " . 
