Yes, Trashlight is definitely a goth band because most of their albums belong to the Gothic Rock and Deathrock genres, which are among the core subgenres of goth music. Albums like Honey Insulation and Darling Darkling // Black Mineral Hotel are examples of their goth sound.
Trashlight is located in United States, Louisiana, New Orleans, active in 2015 — present. You can find more information about Trashlight on their GothDB band page.
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