BpmDj just got a new nearest neighbor module. One that is a lot better than our previous attempts. The drawback is that it requires a reanalysis of all tracks, which takes some time. The new nearest neighbors considers a song near if only a few of the repetitions in the rhythm pattern change. Of course that can go in two directions: something can be added or something can be removed. Imagine a 4/4 beat with a 1/16th hi-hat overlaid. A near neighbor can be simply a 4/4 beat (the 1/16th being removed) or a 4/4 beat with a 1/16th hi-hat and a 1/8th snare (in this case only a 1/8th snare was added). The result is a nearest neighbor algorithm that will provide you with a series of candidates in all directions. Thereby you still have to decide on the direction in which you want to take the mix. More at http://bpmdj.yellowcouch.org/nnn.html
With this mix I went so far out of my comfort zone that I'm not even sure this qualifies as metal. It does sound like it though.
