Song of Light
The Song of Light is a song featured in Spirit Tracks.
Link learns it at the Trading Post. After traversing through a cave filled with Like Likes, Link can find the Sound Stone in the northwest corner of the area that will teach him the notes. He can then use it to shoot a beam of light out of a hidden beacon, which will show him the location of a switch that can be hit with his Boomerang to create a bridge. These beacons are found in many other puzzles as well, both in the trading post and other areas.