The soundtrack of your pen?

Currently writing while listening to The Assassination of Jesse James by the Coward Robert Ford OST, by Nick Cave and Warren Ellis. Moody and evocative, and highly adaptable to whatever I'm working on at a specific time. I've used this particular soundtrack as writing background for several things, and I'm wondering: what is it YOU all listen to when you write? Do you listen while you write, or maybe just before? Just after? What tune is in your head for a specific type of scene? Are certain songs interchangeable for other projects or do they only fit once? Are you the type of writer you prefers silence while you create?

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Random writing exercise: Pick one phrase you heard someone say while out and about this past week and write an entire conversation based off of it. Just the one phrase, taken out of context of whatever was going on when you heard it.