If you ever want to pick a music to play in iOS, this is the step unlock your device -> open "songs" app -> pick your music to play. Imagine, if you are driving, this will drive you crazy. Developer (rvirajm) had just developer a tweak for jailbroken iPhone. With this tweak, you can simply double click home button to bring the music picker. Then tap at the icon and select your song. Is that simple.