Brendan Chilcutt has created the Museum of Endangered Sounds, where you can revisit technological sounds of yesteryear: PacMan, a dot matrix printer, a dial telephone, and a 56K modem connecting over a phone line. It was that last example that caught the fancy of Atlantic Technology columnist Alexis Madrigal: Of all the noises that my children will not understand, the one that is nearest to my heart is not from a song or a television show or a jingle. It's the sound of a modem connecting with another modem across the repurposed telephone infrastructure. It was the noise of being part...