It would be neat to add that back, I gave it a listen. The "menu music" options only show "Default" "Classic" and "Expedition", I assume it was made in advance for the Infusion DLC but then it became a standalone game, leaving three options, two for the Expedition music and one of the vanilla music. It would be a good way to rename the current Classic as "Vanilla" and then add the old music theme as "Classic", while "Default" oughta be removed