Would like to prevent sleep when using in car

When you're in playback mode and you've expanded the tab up from the bottom which shows the current playing track and its information, I'd like that screen to prevent the device from going to sleep like the GPS Navigation stuff does. Normally when I leave it on that screen it's because I have it hooked up to my car audio and trying to figure out how to unlock the thing if it goes to sleep while in the car is a pain. Not to mention it'd be nice to just glance down at the screen to see what the song was that just started playing when the song changes without having to wake it up again.
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