The tag alias #56542 retrowave -> synthwave has been approved.

Reason: Retrowave and Synthwave describe the same concept - 80s inspired retro art with a certain set of visual elements, "Synthwave" is more accurate, better known, and has more images tagged on site.

Example:
post #3010924

EDIT: The tag alias retrowave -> synthwave (forum #327075) has been approved by @bitWolfy.