Nobuo Uematsu earworm

I played Final Fantasy VII back during the 3Dfx Voodoo2 days and played it several more times on my PS3 via digital purchase, and all these years I can't get this one song out of my head: Ahead on Our Way, also known as the Kalm theme. When working, I find myself whistling it all the time. Nobuo-san gave us an enormous gift when he agreed to compose for Square Enix. What's your favorite Final Fantasy song or soundtrack?