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I am sure there are other apps that have this feature as well, but PocketMusic has a feature that allows you to turn the screen off while playing music. This has a couple obvious benefits, it saves battery power, and makes the screen inactive.
The display on/off action can be mapped to one of the hardware buttons. In fact, many common actions can be mapped to hardware buttons (such as stop, play, next, previous, volume, etc.). Mapping common actions to hardware buttons allow you to execute these actions even while the screen is inactive.
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