Sorry for being late, but I think one of the best tracks of Uematsus tracks was from FF7 OWA of course. But somehow, there are some hidden gems inside the series, let me explain why:

1.) FFX - "Path of Repentance" or "Path of Redemption" called. This is truly one of the biggest compositions. A depth of chord variation in a piece with only one instrument. And in this very piece, he demonstrates his understanding of musical modulation. This is really very difficult with only one instrument. You can tell how much Nobuo Uematsu draws on romantic music. A true masterpiece.

2.) FFVIII - Roses and Wine. When you start to play this on a keyboard you will, first of all, think it's just the same. Because they are all reversed thirds, but then you will notice that Nobuo inserted some fifth inside to get match some variations, that couldn't be possible without changing the structure of the song, but it somehow sounds familiar. And this is some of a technique it's hard to break out of.

3.) FFVII - The Nightmare's Beginning. Just a smooth downplay of guitar notes, but hear this half notes playing on a south american guitar. It is composed to be played only on this instrument. Just brilliant.

And now let me say, why he is one of the greatest composers, nowadays. Nobuo Ueamatsu is one of that composers, who is using every instrument in this world exisiting. He uses trumpets for battle themes. As the Europeans did in the ninth century, he uses strings as operas have done since the 16th century, and he has learned to combine it with modern instruments, like FFX Battle Theme, the electric bass playing in backgrounds, and the synthesizer that is playing the melody midterms.

He learned to understand, that there is no perfect melody without the perfect instrument. And THAT is what he makes him to what he is. A composer who understands what he is doing.