play music 
wake up music player
While the music player is active, your phone conserves battery power by turning off the display and keypad backlights.
To turn display and backlights back on, press any key.
music player tips
If you receive a call while playing music, the music pauses. You can Ignore the call and send the caller to voicemail or Answer the call. Playing resumes when you end the call.
To hide your music player while a song is playing, press Options > Hide. If the music player is hidden, you can use other phone features. Using applications, such as games or FM radio, turns the music player off.
Note: You can hide the music player when you’re using the speaker or a wired headset but not a Bluetooth® headset.
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