1951: Numerology loomed large in the life and musical compositions of Arnold Schoenberg. He was convinced that certain numbers and combinations of numbers were either benign or malign. “It is not superstition, it is belief,” he explained.
The number 13, in particular, filled Schoenberg with apprehension. He was born on 13 September 1874. In 1950 he reached the age of 76 (numerologically significant because 7 + 6 = 13). Since he was born on the 13th of the month, he feared he would die on the 13th of the month.
As it happened, he was spot on. He died on Friday, 13 July 1951, at a quarter to midnight – another 15 minutes and he would have been out of immediate danger.
Source: Willi Reich, Schoenberg: A Critical Biography (1971), p. 235