What trifles constitute happiness! The sound of a bagpipe. Without music life would be a mistake. The German imagines even God as a songster.
Aphorism 33 in full (Ludovici, 1911). The famous line is the middle sentence — the bagpipe and the singing God around it are usually dropped, along with the joke. German original: “Ohne Musik wäre das Leben ein Irrtum.”
✓Public domain
The German text was first published in 1889 and Ludovici’s English translation in 1911 — both well before 1931, so the wording quoted here is in the public domain in the United States. (A modern copyrighted translation, e.g. Kaufmann or Hollingdale, would be a separate rights question, but the classic ‘a mistake’ wording predates those.)
⚠ This reflects the original work, which is public domain. If your exact English wording comes from a specific modern translation, that translation may itself still be under copyright — check the edition you quote.