The Keystone song people usually mean for Supergirl is “What Becomes of the Brokenhearted” by Jimmy Ruffin, which appears in trailer/music listings tied to the franchise.

What it refers to

In online discussions, “Keystone song” seems to be a mix-up or shorthand for the track associated with Supergirl trailers rather than a song from the show’s regular score.

Related Supergirl music

  • The 1984 film Supergirl is also strongly associated with Jerry Goldsmith’s main theme and score.
  • The TV series had episode-specific licensed songs listed in soundtrack roundups, so different people may mean different tracks when they ask this.

Practical read

If you meant the song most directly linked to the recent Supergirl trailer, it’s “What Becomes of the Brokenhearted.”

If you meant the classic film theme , that’s Jerry Goldsmith’s “Supergirl” main theme.