From Final Fantasy Wiki

"Dungeon" from the GBA version of Final Fantasy
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In most earlier games in the series, most Dungeons used a default theme often simply called Dungeon, which varied from game to game. The presence of this track is somewhat exclusive to early titles of the series, where space restrictions did not allow a great variety in sounds. More recent titles now have a different theme for each dungeon in the game, or dungeons that share a greater amount of tracks.

Appearances

Final Fantasy

Ironically, "Dungeon" can only be heard at the Marsh Cave and in some floors of the Soul of Chaos dungeons and the Labyrinth of Time. In fact, two other tracks are shared by the game's dungeons: "Matoya's Cave" and "Mt. Gulg".

Final Fantasy II

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"Dungeon" from the Famicom version of Final Fantasy II
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In Final Fantasy II, "Dungeon" can be heard at the Semitt Falls, Bafsk Sewers, Snow Cave, Deist Cavern, Tropical Island, Cave of Mysidia, Leviathan, Jade Passage, and Unknown Cave.

Final Fantasy III

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"The Dungeon" from the DS version of Final Fantasy III
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"Dungeon", also known as "The Dungeon", plays in the Sealed Cave, Subterranean Lake, Amur Sewers, Ancient Ruins, and Bahamut's Lair.

Final Fantasy IV

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"Dungeon" from the DS version of Final Fantasy IV
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Final Fantasy IV is one of the games which gives the most use to "Dungeon", known as "Into the Darkness" in previous versions, as it plays at the Mist Cave, Underground Waterway, Antlion's Den, Ancient Waterway, Lodestone Cavern, Eblan Cave, Sealed Cave, and, exclusively in the Advance version, in the Cave of Trials.

It is reused for Final Fantasy IV: The After Years.

Final Fantasy V

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"Dungeon" from Final Fantasy V
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Final Fantasy V's "Dungeon", also known as "Fate in Haze", can be heard in the Pirates' Hideout, Torna Canal, Walse Tower, Underground Waterway, Basement of the Castle of Bal, and Istory Falls.

Final Fantasy VI

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"Phantom Forest" from Final Fantasy VI
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Phantom Forest is used as the theme for most dungeons.

Dissidia Final Fantasy

Although no dungeons appear in this game, Final Fantasy's version of "Dungeon" was arranged and used as a battle theme in this game.