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The sound of a number being dialed on a telephone is instantly recognizable.

But nowadays, how often do you really hear those sounds?

When we call a friend, we just scroll down to their contact.

When we call a business, we Google it.

Tap the phone number and tap to call.

Or we just ask our phone to call it for us.

Calling Music Millennium.

Up until pretty recently, every call you made meant dialing all 10 digits of a phone number,

one button at a time.

And that meant hearing those tones over and over.

If there was a phone number that you dialed a lot, like your best friend or your parents,

you'd eventually memorize what their numbers sounded like.

Strung together, the tones would start to sound almost musical,

like a jingle you couldn't forget, even if you tried.

But before we can jump into the push-button phones that most of us are familiar with,

we need to go back to the very beginning.

...