 Much of the music from the original Kingdom Hearts is present in Chain of Memories ; the main vocal theme for the Japanese release is " Hikari " ( 光 ) , while the English version of " Hikari " , " Simple And Clean " , is used in the Western releases . Additional and reworked tracks were created for its PlayStation 2 rerelease , Kingdom Hearts Re : Chain of Memories . Since the music is reused from the original , a Chain of Memories soundtrack was never released . The new reworked tracks , however , are included on two CDs in the Kingdom Hearts Original Soundtrack Complete . 
