When voting opened for Composition Combat, I sent messages to my friends, telling them where to hear my submission and asked them to rate the song. I also gave them a link to the registration thread so they could hear the other songs that were submitted. Seemed like a fair thing to do.
On the other hand you have people like Kidd Cabbage telling his friends and followers not only to score him perfect, but to rate the other songs "negative" stars. See this thread:
http://www.metroidmetal.com/ridley/v...php?f=6&t=7802
I have no doubt that all his friends did exactly that, because in one night after having an average rating of 6.4, the next day I had almost a full point lower score. I noticed many other songs that were highly scored had come down dramatically as well.
This may or may not be officially counted as cheating, but I think it's pretty telling of the character of the people involved.