 Kingdom Hearts was wildly successful , shipping more than four million copies worldwide ; Shimomura 's music was frequently cited as one of the highlights of the game , and the title track has been ranked as the fourth @-@ best role @-@ playing game title track of all time . The soundtrack has led to two albums of piano arrangements . Kingdom Hearts was the last soundtrack that she worked on at Square . After the release of Kingdom Hearts in 2002 , Shimomura left Square for <unk> leave , and began work as a <unk> in 2003 . She has built on the work she did while at Square ; since leaving she has composed or is composing music for eleven Kingdom Hearts games and Nintendo 's Mario & Luigi series . She has also worked on many other projects , such as Heroes of Mana and various Premium Arrange albums . On February 10 and 11 , 2014 , Shimomura played piano at a retrospective 25th anniversary concert at Tokyo FM Hall . She performed songs from games such as Kingdom Hearts , Live a Live , and Street Fighter II . During the <unk> the Forest 's Mushrooms performance from Super Mario RPG , Shimomura was joined onstage by fellow game composer Yasunori Mitsuda , who played the Irish <unk> . She is currently working on the scores for Final Fantasy XV and Kingdom Hearts III . 
