When I'm coding it's 9 out of 10 with ambient soundscapes. Couple of example cd's I put on;

Vestigial – Vestigial "Solar/Aeon" Apocryphos – Onyx Atrium Carceri – Cellblock Desiderii Marginis – Hypnosis False Mirror – Derelict World

And other likeminded music. And the other 1 / 10th is hardcore metal / beatdown. Bands like; nasty, enemy ground, I am revenge, no turning back, spawn of disgust and other bands like it.