15. The operator's ode
Quick: When was the last time you actually dialed "0" on a phone and spoke with a human operator? Odds are, the answer is (a) a long time ago, (b) never, or (c) what the hell is a human operator?
16. The radio tuner's tune
Static. A high-pitched squeal. Talking. More static. A little music. That's the unmistakable sequence of an AM radio dial being manually tuned -- something bound to sound completely foreign to a 12-year-old in about 10 years.
17. The cash register chorus
Aside from Pink Floyd jam sessions, the sounds of the old-fashioned cash register ringing up and cashing out are becoming increasingly sparse these days. Sure, we've got the beep-beep of the barcode scanner, but a digital beep can only have so much character.