Need help finding the name of this beautiful audio

It happened when i was in ash canyon and timberwolf mountain i think. Im not sure of the instrument, but it sounded like a long violin but deeper tone. It had like a long high note long low note, then went up one key and a long high then a long low. It was just a perfect song when i had my campfire going staring out at the map on top of a mountain. Does anybody have any idea of what it was. Im on interloper survival if that helps.