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Im afraid you can't do it.. you can have full access to the phone only when you unlock it otherwise you will be getting the popup message to enter unlock code... To resolve this you ought to get your phone unlocked from any commercial vendors online like Theunlockarena.com or even you can contact your SP for the codes...
You'll not be able to access the WALKMAN nor the camera function if you're using a pattern lock/PIN lock security on your phone. You need to use the swipe function on your screen security to be able to use these fast functions. When you press the ON/OFF button when you have the swipe function you will find a musical note and a camera icon next to the time and date on the locked screen.