So, I am told -- and could be wrong -- that the subtle art of DJing requires many little tricks in tandem. Some are obvious, like similar tempos, similar "energy" (I have never heard a definition of this I could understand). Also, from one song to another, you're only supposed to move either major to minor, minor to major, or change just one letter. That's known as the Camelot method and it may be a lot of hot air.

Another trick I heard was taught in schools was "don't tickle me with a feather and then hit me with a brick."