Yoko Shimomura has been composing in the video game music industry since the late 1980s. Early on, she was a recurring composer for Capcom (and was part of their in-house jazz band Alph Lyla), and then for Squaresoft, and more recently a freelance composer. More recently, she is probably best known for composing the music for the Kingdom Hearts series, as well as Mario RPG music, starting with Super Mario RPG (while at Squaresoft) and the entire Mario & Luigi series since.Contrary to popular belief, Shimomura did not compose Mega Man 6. The soundtrack for that game was composed by Yuko Takehara instead.
Street Fighter II: The World Warrior (1991): Credited as Pii♪. She composed nearly the entirely soundtrack, with the exception of Sagat's theme and the Round Start and New Challenger jingles, which were composed by Isao Abe
Xenoblade (2010, along with ACE+, Manami Kiyota and Yasunori Mitsuda): She was the lead composer and wrote personally a tenth of the soundtrack, including the now classic Main Theme, which is considered one of the best works in her entire career. Yasunori Mitsuda returned only to compose the ending song, but Shimomura borrowed some of his signature style associated with past Xeno soundtracks. And, since Xenoblade is far more of a Planetary Romance than previous Xeno games, her compositions also bear Chrono Cross influence.