If all four of your party members die, you'll hear the Dead Music. The tune has the downbeat you'd expect from a game over theme.
There isn't an official English release of the song. The Japanese title uses katakana, デッドミュージック (Deddo Myujikku). Which directly translates into English as "Dead Music."
This song appears on a couple albums.
|1989-02-28||All Sounds of Final Fantasy I-II||デッドミュージック (Deddo Myujikku)||Dead Music||Original NES||42|
|2002-10-23||Final Fantasy & Final Fantasy II: Original Soundtrack||デッドミュージック (Deddo Myujikku)||Dead Music||PS1 Remake||1.21|