I know everyone is going to have a different opinion on this, interested on thoughts really. Mixing in key makes for a nice sounding mix I am the first to admit that. But does it not seem a bit robotic like to you, looking through your library of tunes to see which ones match then pairing them together until you've got a set list. The way I see it is try out tunes in your box and simply using your knowledge as a DJ you will quite often tunes that go well together whether they are in key or not. Just my opinion, how many people on here do the mixing in key?