Xenogears contributor Tomohiko Kira played guitar on the beginning and ending themes . Noriko Mitose , selected for the role by Masato Kato , sang the ending song " Radical Dreamers ~ Unstolen Jewel ~ " . Ryo Yamazaki , a synthesizer programmer for Square Enix , helped Mitsuda transfer his ideas to the PlayStation 's sound capabilities . The soundtrack have been described as having " some of the most haunting melodies known to man " . The " Home World " tracks from the soundtrack have been termed " emotional " , " driving " and " striking " , while the " Another World " tracks are described as " slower " , " dreamier " , and more " serene " than their counterparts .