Here's the current selection of MIDIs for the soundtrack of NeoFirst. This differs from the Credits topic in that it lists which areas of the game certain music tracks are assigned to. Feel free to suggest any replacements for current selections, or make suggestions for assignments not made here.
Locations:
Mystic Woods (Introduction): Auspice, by Saffith.
Overworld: Hylian Overture, by Saffith.
Hyle Town: City (Title Pending) by Sir_Johnamus.
Mystic Woods: Dark Forest by Rexlaninetales.
Endless Desert: ??? (Samasa Desert) by Kyopi M-Adachi. Sequenced by Alop.
Mt. Frostburn: Winter Wind, by Frédéric Chopin.
Wicked Wilds: ??? (Temple of Seasons ruins) by Kyopi M-Adachi. Sequenced by FireMario.
Forest Temple (L1): Pinnacle by Mighty Darknut / Sharon Daniel.
Stonewater Grotto (L2, Fire): Volcanic Subterrane, by Saffith.
Stonewater Grotto (L2, Ice): Rime Cavern, by Saffith.
Temple of Chaos (L3): Ophidian, by Saffith.
Chaos World (L3): Mars, the Bringer of War, by Gustav Holst.
Mini-Dungeons:
Caves 1: Gnomus, by Modest Mussorgsky.
Caves 2: Reverie, by Claude Debussy.
Witch's Grotto: Uranus, the Magician, by Gustav Holst.
Life's End (Catacombs): Adagio in G-, by Tomaso Giovanni Albinoni.
Winter Garden: L'inverno, by Antonio Vivaldi.
Fort Aquatius: Etude in F-, Op.10, No.9, by Frédéric Chopin.
Lakeside Labyrinth: See, the raging flames arise, by Handel.
Sand Labyrinth: Il vecchio castello, by Modest Mussorgsky.
Hyrule Castle: What if a Day, by Thomas Campion.
Skull Woods: Sicilienne, by Gabriel Fauré.
Copse Labyrinth: Catacombae, by Modest Mussorgsky.
Tail Cave: ??? (Tail Cave) by Kazumi Totaka, Minako Hamano and/or Kozue Ishikawa. Sequenced by Jay Reichard.
Scenes:
Fairy Fountain: Dance of the Spirits of Water, by Gustav Holst.
Miniboss 1: First Suite for military band in Eb (Intermezzo) by Gustav Holst.