All of the MIDI's i've collected have been Final Fantasy songs so far, here they are!
Final Fantasy X
To Zanarkand
Thunder Plains
Final Fantasy V
Go Go Boko!
Final Fantasy VI
Techno De Chocobo
Terra
Final Fantasy VII
Aeris' Theme
Anxious Heart
Don of the Slums
Farm Boy
Fiddle de Chocobo
Forested Temple
Gold Saucer
Goodnight Until Tomorrow
If You Open Your Heart
Interrupted by Fireworks
J-E-N-O-V-A
Jenova Absolute
Lifestream
Rufus' Welcoming Ceremony
Steal the Tiny Bronco
The Countdown Begins
Tifa's Theme
Final Fantasy VII Opening Titles
Final Fantasy VIII
Ami
Balamb Garden
Eyes On Me
Mods de Chocobo
Waltz for the Moon
Final Fantasy IX
Aloha De Chocobo
Black Mage Village
Dali
Boss Battle theme
Crossing the Knoll
Dissipating Sorrow
Forgotten Memory in the Storm
Kuja's Theme
Last Battle
Loss of Me --Beatrix's Theme
Melodies of Life and Final Fantasy
Branbal
FFIX - Terra
Treno
Ukelele de Chocobo
Vamos Alla Flamenco
Vivi's Theme
You're Not Alone