If you want your lock screen unique, you must personalize yours lock screen's wallpaper as well as information on the screen. The lock screen will show the new wallpaper and information that might be important to you, like the time and date, or missed phone calls and new voice mail messages, text messages, alarms, appointments, or emails.
To Customize lock screen:
1. Access Settings from start screen.
2. Select Lock screen.
3. Press change wallpaper. Choose the picture that you want to use as your wallpaper. If the picture doesn't fit in the frame, adjust the picture until you have it where you like it, and then tap Done.
To show artist art on the lock screen when play music
1. On Start, flick left to go to the App list, and then tap Settings > Lock + wallpaper.
2. Switch Show artist when playing music to On.