Since this game's producer was Mie Kumagai, who also produced games like Virtua Tennis 4, BORDER BREAK MOBILE and Squads for SEGA's R&D2, I think (especially hearing the music for the first time) that the BGM to Yumeiro Cast is by the R&D2 sound team (so Fumio Ito, Megumi Takano, Yasuyuki Nagata, etc.)