"Aquaman in Atlantis" is a theme in the DC Extended Universe that represents Aquaman. It was originally written by Danny Elfman.
The theme's first appearance was in Justice League, and was first heard when Aquaman arrives at the Atlantean Stronghold to fight Steppenwolf. Despite its title, Aquaman does not actually arrive within Atlantis at any point in the film.
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Justice League Official Soundtrack - Aquaman in Atlantis - Danny Elfman - WaterTower