If you are experiencing this problem then try another memory card this may because of faulty memory card. Or
Go to settings =>> storage =>> unmount SD card after this
Go to settings =>> applications =>> Manage applications =>> All =>> music, remove everything also remove everything from gallery
Then turn off your mobile phone do not remove battery, remove only memory card now hold the power button for several seconds after this insert memory card battery and switch on your mobile. This may solve your problem.
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