When someone goes to a concert of so-called serious music, they generally have one of two kinds of concert experience.
The first is a chance to hear an artistic masterpiece: an immortal work of art created by a genius and performed by an equally brilliant maestro who can interpret the work exactly as the master intended. Think of the TSO playing the entire cycle of Mahler symphonies and you have a pretty good idea of what that's supposed to look and sound like.
The other type is the concert-hall-as-museum approach. Instead of great art handed down through the ages, you experience the music as something kind of alien: coming from another time and place, it doesn't relate to your own experience, and in some ways it has nothing it wants to say to you. It was music to which other people danced, prayed and sang to one another. Like an artifact in a museum, it was left behind by its original owners when they decided they didn't need it any more.