Board Thread:Questions and Answers/@comment-9585083-20130524124747/@comment-5290733-20130524233441

Actually, just on NND alone there are 15 utattemita with more than 10,000 views and 2 others that are from utaite with pages on the wiki.

To answer your question, a cover is a counted by the video number, not number of singers. There are special requirements for songs with 3 or more singing roles. These requirements can be found on the Qualifying singers page.