Gosh, having to pick just one piece makes it difficult. My lullaby as a baby was 'March Slav' alternating with 'Capriccio Italian'. I did not even get into contemporary music until I was in my early twenties.
Therefore, there are too many composers of note to mention, through any period you care to name. So I will just leave it at that.
The one piece of music that always lifts me up and pierces my soul, sending shivers along my spine at a specific point, [Every time, no matter how many times I listen to it], is the Choral Finale of Mahler's 2nd. I have never experienced a more glorious spirit lifting piece of music. Leonard Bernstein's interpretation is my favourite, as he is just so invested in it that he almost becomes the music.