Plagarism is a really big deal when it comes to this competition. It's so big a deal that I do not tolerate it at all if I catch it. That also means that saying that someone has plagarized is also a huge deal. This won't help the current situation, but, for now on, if you suspect someone of plagarizing, PM or e-mail me. Don't post it in the thread. This way, all claims can still be taken seriously without ruining the reputation of those who might be innocent. Also, if you claim plagarism, I expect a means of verification. I will not have witch hunts in CMC.
That said, now we have to deal with this one. First off, there are only so many notes in the world. Occasionally, pieces of music are going to sound similiar, whether by intention or by accident. However, unless actual plagarism has occurred - as according to law and the rules of this competition - similarity is not a reason for disciplinary action.
Blue.Nocturne, I'm sorry you've had to deal with this. I'd encourage you to keep the current piece in place. There is no precendent, at the moment, for swapping songs after they have been released. I'm naturally hesitant to create a precendent that I may regret later. However, if you feel there is no alternative, please PM me or IM me and we'll keep talking.