Mostly (technical | progressive) death/black/djenty metal, things like Periphery, Jinjer, Devin Townsend, Keith Merrow, or even Yngwie Malmsteen and DIO.
I think it helps me relax and liberate the stress of constant tension for thinking and coding during long periods of time :)
And I listen to that music wearing some nice in-ear monitors to get better noise isolation and more sound spectrum!
I work at home, so I get to use proper studio monitors for full sound spectrum. Losing that is one of the hardest things I have to do when going to an office!
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