The Android operating system for cell phones from Google lets you run multiple applications at the same time! By long pressing your home key (touching and holding) you can easily go back and forth between your most recently used apps. When you listen to music, you can easily switch to other apps while still enjoying your tunes! This video shows you the gist of it. Learn to run multiple apps on your Android-powered phone.
* Please note that this video is for devices running Android 1.5 and 1.6.