If all music did was bring the past alive, that would be fine. You can hide away in music and let it recapture memories of things that used to be.
But music is greedy and it wants more of your heart than that. It demands the future, your future. Music wants the rest of your life. So you can't rest easy.
At any moment, a song can come out of nowhere to shake you up, jump-start your emotions, ruin your life.