10nin Matsuri (10人祭; "10 Person Festival") was one of three special "shuffle units" from Hello! Project in the summer of 2001. The shuffle theme was "summer festivals" and they had traditional Japanese festival song. They released only one single, "Dancing! Natsu Matsuri" (ダンシング！夏祭り; "Dancing! Summer Festival") which included their version of a c/w song that was shared by all three shuffles. True to their name, they had ten members selected from Morning Musume (Natsumi Abe Read more on Last.fm