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Metalcore is a subgenre of hardcore punk combining various elements of extreme metal and hardcore punk. The name is a portmanteau of the two genres. Metalcore is distinguished from other punk metal fusions by its emphasis on breakdowns: slower, intense passages conducive to moshing. This is a place for news, reviews, videos and discussion of your [favorite metalcore bands](http://en.wikipedia.org/wiki/Category:Metalcore_musical_groups).
Death metal is a subgenre of heavy metal music. Descended originally from thrash, it often employs heavily distorted guitars, tremolo picking, deep growling vocals, blast beat drumming, minor keys or atonality, and complex song structures with multiple tempo changes.
Deathcore is an extreme metal subgenre/subgenre of metalcore. It is an amalgamation of death metal with metalcore or hardcore punk, or both. It is defined by an "excessive" use of death metal riffs, blast beats and use of hardcore punk breakdowns.
Melodic death metal is a subgenre of metal that combines elements from the new wave of British heavy metal with components of death metal. Melodic death metal began in the early 1990s through the rise of bands such as In Flames, Dark Tranquillity and At The Gates. /r/melodicdeathmetal is is a place for news, song sharing, and discussions on all things related to melodic death metal.
Science Fiction, or Speculative Fiction if you prefer. Fantasy too. Asimov, Bradbury, Clarke, Dick, Heinlein and other SF books. SF movies and TV shows. Fantasy stuff like Tolkien and Game of Thrones. Laser guns, space ships, and time travel. etc. Star Trek, Battlestar, Star Wars, etc.