I don't know why, it's the same reason why you like some music and you don't like others. There's something about it that you like. Ultimately I don't find it's in my best interests to try and analyze it, since it's fundamentally emotional.
When I first started acting, and we would all sit down and talk about Shakespeare and how great it was. I thought well, I suppose it is.
The fact is that great musical pieces take and hold the stage because they provide great emotional experiences.