Mine would be the Temple themes more specific the Fire Temple the first time I played OoT the chanting got stuck in my head and I'd annoy my brothers with it.
i like the serenade of water, the forest temple music, the fire temple music, the shadow temple music, the sub-boss music, and the music for the fire-based bosses
The music in Ocarina of Time is my favorite video game music by far, I love each and every song in it. If I had to pick my favorite song it would have to be Princess Zelda's theme. My favorite warp song is Nocturne of Shadow.