Sound Stone

Everything About Fiction You Never Wanted to Know.
After all of the work I went through, this song better be good...
"Take a melody... Simple as can be... Give it some words and sweet harmony... Raise your voices, all day long now, love grows strong now, sing a melody of love, oh love."
Eight Melodies, MOTHER 1

The Sound Stone is a specific type of MacGuffin which is an instrument, melody, music track, or part of a song which must be used or collected in order to achieve some purpose. Often a Sound Stone instrument must need another Sound Stone melody to work.

Very common in Video Games, especially RPGs. Often a form of Magic Music.

The Trope Namer is the Sound Stone, a plot-critical key item in EarthBound which collects and records eight melodies from around the world.

Examples of Sound Stone include:

Anime and Manga

  • The Pink and Black Notes collected by My Melody and Kuromi respectively, in Onegai My Melody. Their MacGuffin nature is most prominent in Season 2: having collected a complete octave supposedly grants the owner a wish, but the two ditzes always waste the wish in nonsensicals, so that Status Quo Is God.
  • The second Pokémon movie had a magical song that could calm the legendary birds, but will not work properly unless the magic spheres are placed in the temple. At the end of the movie, the whole temple turns into a music thing, with the pillars lighting as the different notes are played (and it conveniently gets offscreen when the song strays from those eight notes). Slightly subverted though, in that the "song" was just a duplication of Lugia's cry, and thus would (probably) not have been necessary if the titular Pokemon hadn't been incapacitated.
    • Rise of Darkrai (the tenth movie) also had a music disc that must be placed at the tower to keep the two Cosmic Horror-level Pokemon Dialga and Palkia from destroying the town of Alamos.
  • Level Upper from A Certain Magical Index‍'‍s spinoff, A Certain Scientific Railgun. The only real trial is finding out what it is (a sound file that works using synthesia) and, after the protagonists do that, it serves no purpose anymore.

Live-Action TV

  • The first season of Power Rangers had the Green Ranger's dagger flute, which he used to control the Dragonzord.
  • Psych had an episode with a computer program that needed a quartet to work.
  • Battlestar Galactica has "All Along the Watchtower" as its musical macguffin.

Video Games