Music like REDALiCE

Doujin music (同人音楽, dōjin ongaku), also called otokei doujin (音系同人) in Japan, is a sub-category of doujin activity. Doujin are non-official self-published Japanese works which can be based on official products or completely original creations. Such products are sold online on specialized sites, on the authors' own sites, and in conventions such as the popular Comiket.

Doujin music isn't a musical genre in itself, but is indicative of a particular means of publication much in the same way as the term "indie" is used.

Often, such music will consist of video game music fan arrangements. Much original doujin music also exists, and has been created both for doujin games and independently, spanning many musical genres such as pop, rock, techno, trance, hardcore and many more.