The Hammond B3 Organ. The best instrument known to man.(Note: I'm not being literal and pretentious)
Aside from that, well contrasted music. Example being a melodic female singer doubled with a male singer using a death metal growl.(Epica) Or a well used vocoder leading in to a heavy drop of some kind example being... Pain of Salvation or Ayreon.
Seriously though, organ makes everything better.(That doesn't mean it can make anything good, but better than it was before)