I love basically all the Zelda music of course but here's my favs:
I love all the overworld music, from basically all the games.
TP's Hyrule Field is the most epic so far though (with WW's Great Sea theme at a close second and
ALttP's classic overworld theme coming third).
The Hyrule Castle theme.. man, I love that one. I used to hum it all the time when I was a kid, when I rented
ALttP for the first time. Awesome. I like how it has been re-used since then.
One thing that I really like are all the references to the first
LoZ. The music in the title scenes of
OoT and
TP are based on music from
LoZ. There's also a piece of music toward the end that is a reference to Ganon's first appearance in
LoZ. Of course we have the "secret" melody and "open chest melody" as well, but those two are so obvious.. ^_^ The Hyrule Field music in
TP has parts from the original overworld theme combined with the
TP theme.. which is a great mix.