Remember this?

If you’re under 30, probably not.

It’s a sonogram of a dialup modem connecting to an internet server, courtesy of Scotty Hull on Youtube. Quite beautiful, actually, as long as you don’t have to listen to it to get on line.

For your further edification, Oona Räisänen has diagrammed the component sounds and explained what’s happening each step of the way.

H/T: Flowing Data