Board Thread:Wiki Discussion/@comment-12633677-20131230012638/@comment-12633677-20140314191138

The difference is, "Existence" has a human back-up singer, while in "ray"'s case human singers are credited first and Miku is relegated to the featuring position.

But yeah, I guess that would be the way to handle it. I still the name of the band is rather funny... "Bump of Chicken"? Lol.