There is a white version (trance) and then a black (hard trance/techno) version the week after. The theme is that everyone dresses in the color, just kinda an understood rule. I went to the White edition last summer and I must admit, never seen anything more beautiful than a sea of 35,000 people dressed completely in white. Still waiting to hear word for this summer, can't wait to go back I have the DVD that has footage of both the white and black editions, very good memories.