The man who cleans up blood after murders

This caught my attention:

> I usually work with my headphones on because music helps me concentrate. I always listen to the same three things: Tristan und Isolde by Wagner, 666 Number of the Beast by Iron Maiden and Paranoid by Black Sabbath. The opera relaxes me, it helps me concentrate and prepare mentally. But once I put my uniform on and start cleaning, I want to listen to heavy metal.