One of the nice things about multitasking is it allows you to listen to music or the radio using a streaming app like Wunder Radio while you surf the web. What if a song comes up and you want to skip it with out leaving your web browsing session?
Just double tap on the home button. This brings you to the multitask bar at the bottom of your iPhone. Now slide your list of apps to the right, and like magic you now have basic controls of your music right on the bottom of the iPhone screen. You can pause, skip and rewind whatever you are listening to and never leave your current app.