[USB500]

Originally Posted by Chama

The popular Miku original songs had been covered by real singers.

Especially "celluloid" has many cover versions. And someone mixed up those covers into one song.
In this version of "celluloid", the singers are changing in sequence and at the end all singers including Miku pour into chorus.

Ciel, imokenp, Yoru, Rumdarjun, ANE, vation, DUNE, Yuuya and Hatsune Miku - celluloid on Niconico douga
http://www.nicovideo.jp/watch/sm1298155
MP3 file "Celluloid Choral Version"
Repost: MP3 file "Hatsune Miku - celluloid full version"

Wow the revised version of Celluloid is really awesome. This sounds like it can be made into an official anime or game OP.