Metroid Prime had a bit more than 2x that much of actual melodic songs, not just percussive effects and arpeggio blips and a few nice grooves here and there. Like Tallon Overworld, Tallon Overworld 2, Underwater Space Frigate, Magmoor Caverns, Chozo Ruins, Phendrana Drifts, Deep Lake of Phendrana Drifts, and that's just the level themes.
All of the main elemental areas in Metroid Prime had great melodic themes. Metroid Prime 2 has a few as well, and Metroid Prime 3 was just unbelievable. It was a different style than previous games; almost EVERY area had a great background tune that had good arrangement structure to it also.