Hi again! Today is the second day of Passover (which is still one of the “do no work days” part of the holiday; the next four are not, and the last two I treat like the middle four), so I’m taking the day off. Here’s a re-run, originally shared in the newsletter today in 2015. Enjoy! — Dan

The Hidden Reference to the Beatles in Old Macs

If you used a Mac before it became super-popular to do so, you probably know a certain sound very well. The sound — a short burst, a mix between a bell and a steam train’s whistle — would ring whenever you did something you weren’t supposed to. Hit the delete key too many times, thereby deleting nothing? Beep. Click where you couldn’t? Chirp. Or violate a seemingly innumerate other set of limitations of the operating system? Toot.

Don’t remember the sound? Have no idea what I’m talking about? Don’t worry! You can listen to the sound right now — just click here. And when you click, pay attention to the file name. It’s not Beep.wav or Chirp.wav or even Toot.wav. It’s Sosumi.wav, and “sosumi” isn’t typically the name of a sound. It’s vaguely legalese, even — intentionally so.

Apple Computer — the maker of the Mac — was founded in 1974. Apple Corps, the holding company for the Beatles (and owner of the Beatles’ record label, Apple Records), was founded in 1968. The latter wasn’t too happy about the former’s decision to use the “Apple” name, so out came the lawyers. The Beatles sued Steve Jobs (not directly, but you get the picture) in 1978, and a few years later, the two parties settled. Apple Computer paid $80,000 to Apple Corp, Apple Corp agreed to stay out of the computer business, and Apple Computer agreed to stay out of the music business. (Apple Computer’s decision to start iTunes sparked a follow-up lawsuit, which Apple Computer won.)

For much of the 1980s and 1990s, Apple Computer’s lawyers were hawkish about accidentally making music — they didn’t want the company to violate the terms of the agreement. When Apple Computer created a new operating system (“System 7”) for its Macs in 1991, the question came up again. A guy named Jim Reekes was the lead engineer for the Apple Sound Manager for System 7, and he and his team were creating all sorts of different noises. Sounds need names so that the operating system can find them and play them when appropriate (and so users can customize their sound profiles), so Reekes and team went to work giving each sound a moniker. Sosumi, originally, was called “Chime.”

The lawyers said no. “Chime” was something one would call music, and Apple Computer wasn’t supposed to make music. Reekes jokingly replied that he’d rename the sound “Let it Beep,” a reference to the 1970’s Beatles song “Let it Be,” but apparently, not everyone got the joke. That, as he told Boing Boing via email, gave Reekes a great idea:

Apple Computer’s legal team approved the name, and the Beatles never seemed to object.

Today’s Bonus fact: If you ever had a Windows 95 machine, you’re certainly familiar with the startup sound, but to jog your memory, click here to listen. Unlike sosumi.wav, the “Microsoft Sound,” as it’s officially called, wasn’t created by a computer engineer. Microsoft commissioned well-known musician and composer Brian Eno to create it. Eno made it on a Mac.

From the Archives: With a Little Help From My Friends: How the Beatles helped create a major, life-saving medical device.