後藤真希
Aside from a successful solo career, Matsuura (nicknamed Ayaya), also did numerous collaborations with other members of Hello! Project, including special, usually short lived groups Gomattou with Maki Goto and Miki Fujimoto; Nochiura Natsumi with Maki Goto and Natsumi Abe; and DEF.DIVA with Maki Goto, Natsumi Abe, and Rika Ishikawa. She also did the "Folk Song" series which feature Yuko Nakazawa and other Hello! Project artists, as well as Hello! Project's shuffle groups (3nin Matsuri in 2001, Odoru 11 in 2002, Salt5 in 2003, and the larger H.P. All Stars in 2004).