VI
Terra's Theme
Celes' Theme

VIII
Don't Be Afraid
Force Your Way
Julia
The Salt Flats
Eyes on Me

IX
Crossing Those Hills
Village of Dali
Freya's Theme
Unforgettable Face
Rose of May
Eiko Falls
Daughter of Madain Sari
Terra
Dark Messenger
Melodies of Life
(I love FFIX!)

X
To Zanarkand
Via Purifico
Suteki Da Ne
Lulu's Theme
A Fleeting Dream
Ending Theme

There's a ton more, but these are all I can think of.