Does Remy Zero sing the theme song of 'Gotham City'?

No, Remy Zero does not sing the theme song of "Gotham City." The theme song for the TV series "Gotham" is actually titled "Hey, Hah" and is performed by the band "The Dandy Warhols." Remy Zero is known for their song "Save Me," which was used as the theme for the TV series "Smallville."