There is more than one artist with this name.
1) Nightmare, a French heavy metal band.
2) Nightmare, a Japanese hardcore punk band.
3) Nightmare, an Italian progressive metal band.
4) Nightmare, a Serbian rapper.
5) Nightmare, a Polish thrash/speed metal band.
6) Nightmare, a Croatian rapper
For the Japanese visual rock band Naitomea, see ナイトメア. 1) Nightmare is a heavy metal band from Grenoble, France...

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