Project. R, the group that is responsible in doing Super Sentai themes and Kamen Rider GIRLS, the idol group established for the 40th Anniversary of the Kamen Rider franchise will be putting on a joint series of performances in celebration for their respective anniversaries!
Aside from that, Psychic Lover, Sister Mayo and Iwasaki Takafumi and more (!) are said to be present, and seemingly to sing Goukaiger's themes. All I can say with Toei's anniversary music plans? Birng it on, Toei! Give us your best shot in giving us a good anniversary year!
Source: Toei via dukemon22 via Henshin Grid