 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 maternity leave , and began work as a freelancer 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 Beware the Forest 's Mushrooms performance from Super Mario RPG , Shimomura was joined onstage by fellow game composer Yasunori Mitsuda , who played the Irish bouzouki . She is currently working on the scores for Final Fantasy XV and Kingdom Hearts III . 
 Kingdom Hearts was wildly successful , shipping more than four million copies worldwide ; Shimomura <a href='null_genetive' title='1'><mark>'s</mark></a>music was frequently cited as one of the highlights of the game , and the title track <a href='been_done' title='2'><mark>has</mark></a> been ranked as the fourth @-@ best role @-@ playing game title track of all time . The soundtrack <a href='been_done' title='3'><mark>has</mark></a> 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 maternity leave , and began work as a freelancer in 2003 . She <a href='been_done' title='4'><mark>has</mark></a> built on the work she did while at Square ; since leaving she <a href='been_done' title='5'><mark>has</mark></a> composed or is composing music for eleven Kingdom Hearts games and Nintendo <a href='null_genetive' title='6'><mark>'s</mark></a>Mario & Luigi series . She <a href='been_done' title='7'><mark>has</mark></a> 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 Beware the Forest <a href='null_genetive' title='8'><mark>'s</mark></a>Mushrooms performance from Super Mario RPG , Shimomura was joined onstage by fellow game composer Yasunori Mitsuda , <a href='null_relcl' title='9'><mark>who</mark></a>played the Irish bouzouki . She is currently working on the scores for Final Fantasy XV and Kingdom Hearts III . 
Kingdom Hearts was wildly successful , shipping more than 4 million copies worldwide ; Shimomura  music was frequently cited as one of the highlights of the game , and the title track done been ranked as the fourth @-@ best role @-@ playing game title track of alll time . The soundtrack done led to 2 albums of piano arrangements . Kingdom Hearts was da last soundtrack that she worked on at Square . After the release of Kingdom Hearts in 2002 , Shimomura left Square for maternity leave , and began work as a freelancer in 2003 . She done built on the wrk she did while at Square ; since leaving she done composed or is composing music fir eleven Kingdom Hearts games and Nintendo  Mario & Luigi series . She done 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 . durin the Beware the Forest  Mushrooms performance from Super Mario RPG , Shimomura was joined onstage by fellow game composer Yasunori Mitsuda , played tdaIrish bouzouki . She is currently working on the scores fir Final Fantasy XV and Kingdom Hearts III .