In Majora's Mask, "Song of Healing" is a diegetic track used to obtain the main three transformation masks. It has since made minor appearances througout the series.
Ben Drowned, a fan-made ARG centered around Majora's Mask, infamously features a reversed version known as "Song of Unhealing".
There are currently 12 rips of "Song of Healing" on the channel.
Ben Drowned's use case is referenced within three rips of the Majora's Mask version, as well as within three of MissingNo.'s tracks from King for Another Day Tournament.