This hack aims to add some variety to SMS Shinobi's BGM by restoring the unused music in the ROM.
Mission 1 and 3 keep the original arcade Mission 1-2 theme (BGM 2). Mission 2 and 4 get the arcade Mission 2-1 theme (BGM 3). Mission 5 gets an unused uptempo version of BGM 2. Stage clear and boss defeat tunes are now different (same as arcade). The unused fanfare plays when the final boss is defeated.