I think that music doesn't have that much of an effect on your personality, but it can have slight influence. Sometimes you do feel what the music is saying. An example is at dances.
People get really rowdy, and sometimes really dirty based on the music.
And obviously, if you listen to something enough times, and sing the words you will start to relate to the song. I do think music is influential when in utero. My mom plays the guitar, and sings, and I have been singing ever since I can remember. Music calms me, and when I'm sad I usually listen to music. I think it is because it is something comforting that I know from when I was first a human being.