OK, when I judge, I'mma judge through these:
Quality
Creativity
Interest
Arrangements
Mixing
Some of those are almost the same (like creativity & interest, or arrangements & mixing, but Creativity would be self explanitory, interest being whatever the main instrument your using has to give interest, meaning if you have some piano line that's the main part of your mix, it can't be buried in there etc... it has to keep the listener interested in it... Arrangement would be like break in's, drop's, etc.... Mixing, is well self explanitory, how you mix it down etc... Quality = sounds, and how the whole thing is basically...
and probably more whenever I think of it...
and also maybe like a point system 1-10, 10 being the best, and then add them up, and winner = most points??... I think judges should really judge and be hard on the contestants.

some america's got talent shit haha