Probably the most hardcore classical composer to live. You think your screamo shit is "hardcore?" Then you have not heard of Shostakovich and your opinion is invalid.
Shostakovich was a genius who lived under the oppressive watch of the USSR; as a result, Shostakovich composed some of the most frightening music ever conceived by man.
His Symphony No. 5 and Symphony No. 10 are (arguably) his most badass pieces.
Richard: I hate classical. It's fucking boring.
Mark: You have clearly never heard of Shostakovich.
*After listening to the "Allegro" from Symphony 10*
Richard: Dude, my mind is blown.