Strangely enough, I know why Danse Macabre ended up in the instrumental show at Vividcon 2005, because it was partly my fault. I've never been to Vividcon, sadly, but I know the person who moderated the instrumental show. (The show, by the way, was intended to highlight the various ways people use instrumental pieces in vids; there's no criticism at Vividcon shows, AFAIK, except in the Premiere show, and in that case the vidder is present for it.)
The moderators of the topic shows usually only know vids in some fandoms, but they try for a balance, so they ask for suggestions for vids that suit the topic in fandoms they don't know.
The moderator of the instrumental show still doesn't, to the best of my knowledge, watch anime vids at all (she certainly didn't then, as she had to create an account to download from the org). I was the only person she knew who watched AMVs. So I suggested several AMVs that suited the theme, including yours, and she chose yours.
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The moderators of the topic shows usually only know vids in some fandoms, but they try for a balance, so they ask for suggestions for vids that suit the topic in fandoms they don't know.
The moderator of the instrumental show still doesn't, to the best of my knowledge, watch anime vids at all (she certainly didn't then, as she had to create an account to download from the org). I was the only person she knew who watched AMVs. So I suggested several AMVs that suited the theme, including yours, and she chose yours.