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Originally formed in 2006 as iyunaline, a collaboration between composer unit iyuna and vocalists. In January 2009, they became a music production group and changed their name to solfa.

Its members are:

Composers
~ Iyuna
~ Amagasaki Urara
~ Ibuki Yukihiro
~ Hashizaki Tooru
~ Koharun
~ Whip Shinonome

Player
~ Tadashi

Vocalists
~ Koharu Meu
~ Kawahara Yuu

Former members:
Composers
~ hash
~ Asahi Mitsuya
Vocalists
~ Chata
~ Rin
~ Yuki