iPhone: Looking at your phone when you're trying to drive is hard enough as it is, but changing a music selection is even tougher. Travelling Tunes is a music app that uses gestures to make it easy to move between tracks.
The point of Travelling Tunes is to make it so you can control the music playback without ever looking at the app. That means you can set up gestures to control volume, fast forward and skip songs. You'll still need to use the regular old music app to actually pick the album you want to play, but Travelling Tunes will free you having to look at the screen.