Whether it’s an iPod, a Zen, or a Gigabeat, MP3 players are everywhere. So how do they store up to 15,000 songs in the palm of your hand? In this BrainPOP movie on MP3s, Tim and Moby will teach you what MP3s are, how they’re created, and why they’re so popular! You’ll learn all about file compression and how to create copies of your music that are smaller than normal but almost identical in sound quality. You’ll also find out about perceptual noise shaping, and the devices you can use to make, compress, and play MP3s. So press pause, take out your earbuds, and watch this movie!