There's one thing people noticed long ago - Metal and classical go very well together. The reason is very simple: the roots of metal are in classical music more than in any other music genre. And this has been becoming more clearer over time, with every new stage of the metal evolution. As of the 21st century, after 50 years of metal history, the trends are more than obvious. Some even define metal as classical music in the era of electricity and electric guitars.