djay, the Apple Design Award-winning music mixing app for iPhone and iPad, has just been updated to version 2.5 and the game-changing news is this — they've partnered with streaming music service Spotify and their 20 million track library and, what's more, created technology that lets you quickly, perfectly mix and match all of it. Imagine an old school DJ crate filled with vinyl. Now image it's bottomless. Now imagine a selection of perfectly matched songs is always on the very top just waiting for you to grab and spin. That's djay 2.5.