Moonsong

This page contains spoilers for Fatal Frame: Mask of the Lunar Eclipse.

The Tsukimori Song was performed by the Tsukimori Shrine Maidens of Rogetsu Isle, on the organ in the Gesshou Shrine. It was performed when the moon was resonating, to calm people's souls and prevent Blooming. The Tsukimori Maidens handed it down orally, along with a mirror which would reflect the moon and reveal the melody at a time when it was no longer remembered.

In the 1970s, in his attempt to resurrect the Kiraigou, Yo Haibara attempted to transcribe the melody from an ancient score.

Over the course of Fatal Frame IV, Ruka Minazuki hears it playing on a music box, and later remembers that her mother taught her to play the Tsukimori Song on the piano. As the game progresses, she gradually pieces it together, and finally plays it at the Gesshou Shrine to pacify Sakuya Haibara.

Misc. Info

• The Tsukimori Song is also called the Lunar Melody. It is not the same as the Lunar Melody that each individual has in their souls, but it was intended to have a soothing effect on them.
• In Fatal Frame: Deep Crimson Butterfly you can hear the song playing during the first stage of Haunted House Mode.