At my workplace we have a contractor that listens to hardcore speed metal while coding. The really angry kind...

It is hilarious when you realise how calm he is working on the project, completely opposite to what the music is. My colleague prefers listening to old school rock, and my boss (coder as well) listens to classical music.

Definitely a lot of different tastes out there.

I personally am a trance/techno/electronic/dub step/vocal trance kinda person.