I’ve been listening to a lot of Symphonic Metal lately.
Speaking of Finnish Symphonic Metal, can't go past a little Apocalyptica:
This isn't available on YT that I can find but another mashup from DJ Schmolli:Vikings on Dark Horses
(Amon Amarth vs. Katy Perry ft. Juicy J)
And from one of my favourite places on the planet, The HU ft. Jacoby Shaddix: