Personal MP3 players are a great way to carry huge amounts of music on the go. Personal MP3 players come in 2 flavours: solid state and hard drive models. Solid state MP3 players tend to hold between 64-128 Mb of music and have no moving parts to them (so they can't skip when you do). Hard drive MP3 players (often known as a jukebox) have moving parts (and a buffer to prevent skipping) and can hold between 1Gb and 40Gb of music (that means you could hold around 800 albums of music on a single MP3 player!