The musical score for "Mega Man X" was composed by Capcom's Alph Lyla group. Setsuo Yamamoto (credited as Setsuo) was initially the sole composer assigned to the game, and contributed the vast majority of the soundtrack, but four other composers, Yuki Iwai (credited as Sato), Toshihiko Horiyama (credited as Kirry), Yuko Takehara (credited as Yuko) and Makoto Tomozawa (credited as Tomozou), were brought in late in production to help finish the soundtrack. The first three were responsible for one track each. These tracks were Chill Penguin, Password Screen, and Boomer Kuwanger, respectively. Tomozawa wrote two songs, these being Storm Eagle and Spark Mandrill. Iwai and Horiyama would later compose the soundtracks for "Mega Man X2" and "X4" respectively. The Japanese division of Sony Records published an arranged album featuring ten songs on March 9, 1994. Music using the SNES instrumentals was included as part of the "Capcom Music Generation: Rockman X1 ~ X6" soundtrack released by Suleputer in 2003.