Nightwish - Nemo

Song: Nemo
Artist: Nightwish
Album: Once
Genre: Metal, Hard-Rock
Year: 2004

You can see a lot of examples of nu-metal or hard-rock with orchestral or opera music. It's very common. Long time ago, Black Sabbath [wiki] already did it. And Edward Van Halen [wiki] too. Making an appointment of al Wikipedia [link] article:

"The Encarta encyclopedia claims that "when a text was associated with the music, Bach could write musical equivalents of verbal ideas". Progressive rock bands such as Emerson, Lake, and Palmer and Yes had already explored this relationship before heavy metal evolved. As heavy metal uses apocalyptic themes and images of power and darkness, the ability to translate verbal ideas into musical ideas that successfully convey the ideas of the words is critical to heavy metal authenticity and credibility." [Heavy-Metal wiki].

(Artist official web) (People opinions at Amazon.com) (Wiki link)

Video (YouTube.com) :