Gaur Plain/Night (ガウル平原 / 夜) is a Field Track in Xenoblade Chronicles, composed and arranged by ACE+. It is track 8 of disc 3 from the Xenoblade Original Soundtrack. This music is heard at night on the Bionis' Leg (not including the Refugee Camp) and in the Colony 6 area (outside of the colony proper's Main Entrance).
A modified, trimmed version of this song is also one of the tracks appearing in Super Smash Bros. for Wii U and Super Smash Bros. Ultimate, where it can play on Gaur Plain, the Cloud Sea of Alrest, Final Destination, and the three variants of Battlefield.