Kelly Jacklin, the creator of the now-ubiquitous “Tri-Tone” alert sound on iOS devices:
Fast forward quite a few years, and the iPhone comes out. I was not involved in development of the iPhone, nor iOS, although I was unsuccessfully courted by the iPod software guy (Tony Fadell) right when I was considering the move to work on audio software (I went to the Pro Apps group at Apple instead). So imagine my surprise when the iPhone ships, and the default text message tone is… “158-marimba”, now going by the clever (and not actually accurate, from a music theory perspective) name “Tri-Tone”.
Scroll to the bottom of the article to hear some of the other sounds that could have been used.