I have consistantly thought that the music can either work for or against the couple. Since they have no choice in the dance I think this is a factor that could be worked on to make things a tad more fair. For instance: If a couple has a romantic song with a romantic dance it works in the couple's favor and visa versa. An awkward song can REALLY hurt the appearance of the performance, jmo. I tend to think that if we went back over the best performances they had a good song to work with and the worst performances may very well have started with an awkward song.