User blog comment:TisRis/For more on dancer see link/@comment-9114790-20150617202350/@comment-25927581-20150618071301

for the song thing, you would actually use the disambiguation template  to list different versions of the choreos, similar to the utaite wiki's http://utaite.wikia.com/wiki/Amatsuki. This will be necessary in the future since many youtube dancers end up having the same name as nnd dancers. Also there are many choreos to one song, like Koshitantan.