 It is played at nearly all of their concerts, often accompanied by the stage being lit in red light and the band pausing during the last third in order to let the audience sing the chorus on their own.The single version features that specific bit of a live performance added after the studio recording, hence the title being written as " Kurenai + Your Voice" on the back of the single's case.The B-side is a live recording of the song "20th Century Boy", originally by British rock band T. Rex.