Ace Combat 4 and ZOE2 top my list for games with best music.
ZOE 2 Intro Theme - Beyond the Bounds ZOE 2 - Air Fight ZOE 2 - Zakat ZOE 2 - Ardjet
Zone of the Enders 2 really has too many good tracks to list here but these are my favorites.
Ace Combat 4 overall had the best music in the Ace Combat series, though my favorite track is actually from Zero.
Ace Combat Zero - Zero Ace Combat 04 - Comona