take two halves of your playlist in either hand. bow them outwards, but towards each other with your thumbs facing, letting the songs slip from your thumb at a similar pace, the songs will fall each upon one another, then you can slide the playlist together in it's newly shuffled state. lifting the backs with the heels of your hands to form the bridge is optional but does two things: it bends the songs back the other way so they don't get bent too far one way, and looks really cool.
next up: pile shuffling: 8 or 10 piles for tournament play?