I've been there mate. I had to remove so many of my past creations because of it. The worst part is that I no longer had the files so I couldn't reupload them.
The effect having an audio muted differs on the video's style. My videos were lip sync videos so without the intended audio the video was worthless.
Eh. It's not really that big of a deal to me. I was planning on doing second walkthroughs of the games (the last part of my Kingdom Hearts walkthrough is also muted because of the ending), anyway. I'll just cut out the openings and such.
WTF? How in the hell is a kh walkthrough related to EMI_Music_Japan? I mean that's just stupid! Could it have been the opening video? Regardless that's still stupid!?