Or you can combine 2 great musical genres (Classical music and METAL!!!!) into what is known as Neo-Classical Metal. Yngwie Malmsteen is the guy to look up to in this field. He has redone many classical guitar songs with a metal feel. Not to mention he is one of the best guitarists ever.

Some of his songs you may like:
Canon in D (Pachelbel's song)
Beethoven's 5th
Bach's Bouree in E minor
Paganini's 5th Caprice