1) It's a group of Mike Shiver and Daniel Haze aka Perpetua. They are a trance dj's
2) Death metal band with industrial influences from Buenos Aires, Argentina.
http://www.myspace.com/perpetuamusic
3) Depressive Black Metal band from the United Kingdom.
4) Metalcore, Heavy metal band from Edinburgh, Scotland.
https://twitter.com/Perpetua_Band https://www.facebook.com/PerpetuaUK https://perpetuaband.bandcamp.com/