Writing in the electronic world, you imagine a sound, and then you have to go and find it. It's not like imagining a flute and then making that sound materialize. That's easy!
Horror films are the ones that pay the bills, and historically, they have shown that they are good investments. They helped Universal survive with that initial splash of horror films in the 1930s and '40s. And horror films kept New Line alive with the 'A Nightmare on Elm Street' series.
As a kid, I had a Beatles poster and a Bela Lugosi as Dracula poster, so both worlds always appealed to me. Horror allows you to do things as a composer than you're able to do in no other style of movie. The music has to be aggressive. You can't tiptoe around. It has to be incredibly focused dramatically - no time for second thoughts.