What came to mind right away was Chrono Trigger. Almost every single tune in that OST is excellent and worthy of being on a music device. Funny enough, the main so-so tunes were ones that were cut, haha. Even they knew those 2 weren't quite up to par.
A runner up would be maybe XC2 or Grandia 2. XC2's ost has many excellent tunes, and Grandia 2 has one of the greatest battle themes to ever grace a JRPG.