Great Question! I have been wondering about this also. I guess you could call it an exit/preshow loop; because it plays while one set of guests exits and another set is entering.
I'm assuming several people on here read music, so this might help identify what I assume Horizons is talking about. The most striking part of this loop is the Triplet Theme that is introduced by the strings and repeated in a few spots by the french horns.
Does anyone else know this music?