There are at least three artists named Nightmare City.
1. Nightmare City is a Swedish heavy metal band from Växjö. They have released a demo called Nightmare Tape, in June of 2014. Also, an EP in 2015.
2. Nightmare City was formed in the fall of 2010 by Joshua Woods, who soon began collaborating with Angel Cases of VoiXNoire. It wasn't long until Angel put VoiXNoire on hold to join Nightmare City permanently, bringing a perfect blend of futuristic electro to Joshua's dark and gritty aggressive style. Read more on Last.fm