You know those tracks which you really didn't like when you first heard it, but your opinions changed over time.
I'd like to nominate Persona 3's OST.
My first reaction when I started playing was "Why Jazz/Hip Hop?" But by the time I beat the game, I had the tracks ingrained in memory and can totally jam to them now.
What are some tracks that you began to enjoy as you were exposed to it more and more?