When I was looking for information about a game I across this site.
http://snesmusic.org/hoot/v2/?system=PC-98&page=33
This site hosts music for many Japanese systems, including music for MANY Pc98 games (something like 30 entries per page and 50 pages). However I could not find the music for the game I was looking for "Planets in Legend - Creastar".
The site has a nice faqs for how to get the music to play using Hoot. Here is the link to the How To:
http://snesmusic.org/hoot/v2/faq.php
This is what the Program Hoot looks like.