I owe EVERY midi on this page to Sailor Earth's Music Tavern (once at http://www.angelfire.com/ok/tommygirl33/). That was definitely a good site for MIDIs for Anime.
MIDIs
Fate is so beautiful
Sailor Stars ending
Sailor Stars theme
Tuxedo Mask's appearance music
Just dreaming of you
German Sailor Moon theme
Outer senshi transform music
La Soldier
SM dance mix!!
Cosmic Moon power make up
Rainy Day Man
Call my name
Carry On
Don't fear
Kyofu, Kiki, Mercury no Toujou
Eternal SailorMoon BGM
Fly me to the Moon
Gameboy Mars
Heart moving
Tuxedo Kamen BGM
Luna's BGM
Sharing the same tears
My only love
Moonlight Densetsu
Moon Revenge
Scout attack + transvormation BGM
SM's angel transformation
Another SScouts transvormation
Another NA transvormation
Another Carry On
Don't Fear
Fly me to the moon
German Ending
Heart moving
Melvin's theme
My only love
Approch the Beautiful Mornining
My only love 2
My only love 3
A maiden's policy
She's got the power (2)
Chinese SM theme
BGM when Saturn talks to SM
Alans flute
Reeny's BGM
Reeny's BGM 2
The old Negaverse BGM
Narration BGM
SM transform BGM
Music from "So, you wanna be a superstar"
Slow TM appearance theme
Slow SM theme
SM appearance BGM
Jazzy ending
SM locket
Someday... Somebody...
Starlights' intro BGM
Sailor Ironmouses song