Symphonic Metal
Symphonic metal varies in form. It most commonly refers to heavy metal bands that use orchestral elements in their music. These elements include full orchestras, opera themes, vocals or keyboard playing akin to that of opera or symphony music, and a softer and more upbeat nature than other metal genres. Prominent examples include Therion, Nightwish, Within Temptation, and Epica.
Read more about this topic: Heavy Metal Subgenres