This'll be a toughie. There's tons of favourites from 6, 8, 9/10 and 11/12, among loads of other tracks among the others. I guess I'll stick to ones that
really stick out though. It'd take me all day to work out which of FE4, 6, 8 and 12's map themes are best, for example.
The more I listen to these, the more I remember why I wasn't impressed with FE13's map themes. Wow, we were spoiled.
A ton of Nostalgia's list showed up in my shortlist, too.
FE4 - Fellow People. There are a bunch of variants on this one, and there's a good reason why. This is quite possibly my #1 ranked theme in the series, but it's hard to compare and quantify them all.
FE4 - Chapter 10 (Light and Dark). FE4's map themes were really, really good. It was hard to turn down Ch2 and Ch3 as well. I had to give Light and Dark credit for its return later in the series and becoming somewhat iconic.
FE7 - Inescapable Fate. You might notice a running theme among my favourite... themes.
FE8 - Determination. After the amount of self-afflicted trauma from romhacking, I should really hate this theme for the amount I've heard it. But I don't, I love it despite being a short loop you hear for AGES.
FE8 - Truth, Despair and Hope. FE8's map music was outstanding. I also love endgame tracks that incorporate music you've heard along the way.
FE9 - A Mighty Foe. FE9 and 10 had a lot of good combat themes, but this one takes the cake.
FE11 - Footsteps of Fate. This one was a no-brainer.
FE11 - Trouble. They must've worked extra hard on the music to supplement the lack of engaging plot/characters.
FE12 - Divine Dragon,
Old and
New Saga. Cheating here, because these two really shine as a pair. My favourite variant(s) of Tiki's theme in general. New Saga I especially enjoy.
FE13 - "Don't speak her name!" Obligatory.
All of these songs I really love and you guys should listen to them too