One might expect Arnold Schoenberg, the founder of the dodecaphonic system or twelve-tone composition, to have an aversion to the number 13, which is known as triskaidekaphobia. Not only did Schoenberg stay clear of rooms, floors, and buildings with the number, he carefully searched for anything that added up to 13 in his music. The title of his opera, Moses und Aron, contains only 13 letters because Schoenberg superstitiously dropped the second a in Aaron to avoid the dreaded number. Furthermore, he lived in fear of days numbered 13. As fate would have it, he was born on September 13, 1874 and died, expecting the worst, on July 13, 1951, at age 76 (7+6=13).