Electronic Music is a very broad term. It's exactly the same as saying that Rock, Country, etc. is a subgenre of Analog Music. Or classical, orchestral, etc being a subgenre of Acoustic Music.
Also, if you want to be picky, Rock and Metal are extremely similar, and should not count as two different genres in the sense that you are counting them.
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Now that my little minirant is over, my list:
Rock/Metal: Metallica
Country: Brad Paisley (Even though I don't listen to country anymore)
Rap: N/A
Electro House: Knife Party
DnB: Netsky
EDIT: Grammar