Usually when I play an FF game from beginning to end, I find myself humming the music from the game while doing something besides playing the game.
But I've played through FF3 twice now (NES and DS), and I don't think I could hum a single tune from the game, even the battle music. I am familiar with the music from every other FF game so much, and this one just doesn't seem to have the memorable music found in other FF games. The song that plays in Doga's Grotto (and a few other caves) is pretty cool, but other than that, I haven't been especially impressed by FF3's music. Oh, and also that song that plays in cities where something strange is going on, like the song that plays in Kazus when everyone is cursed. That's a cool song too.
I honestly don't like the world map music. It starts out all cluttered, and it almost reminds me of the FF4 world map music (at the beginning), and doesn't really feel like a world map song. Except that the FF4 World Map song smooths out and the FF3 one continues to sound cluttered and sporadic. The airship songs aren't that great either, compared to other airship songs (except the WoB airship song in FF6, I thought it wasn't great).
I'm not saying I don't like the game, because I do. It's a great game. But the music just doesn't seem to stack up alongside Uematsu's other work. I guess if you have to write so dang many songs and meet deadlines and so forth, you end up skimping out on some stuff for sake of time. Heck, if Uematsu composed music for something like 10 FF games and only did a less-than-perfect job on one, I'd say he did well.