To Zanarkand is my favorite FF track, but my favorite rendition of it has to be Ending Theme:



Speaking of favorite, there's also number two, Fleeting Dream:



I also really like Wandering:



Naturally, Suteki da ne, and I personally prefer the Orchestra Version:



On that note, a remix of it, Yuna's Theme:



And since these were all rather depressing tracks, how about one of the best battle themes in the series, A Contest of Aeons:



...I'll leave it at that for now.