[Demetori] 感情の魔天楼 ～ World's End - Pure Eargasm. Demetori does Touhou covers, but... Just listen... They are just AMAZING. Just pure, awesome metal.

Jehovah's YaHVeH: Faith is for the Transient People

Nuclear Fusion

U.N. Owen was her? Oh Flandre... They had to cover your song and make it awesome.

And this is only a handful of songs of theirs that I love.