I've only ever worked in open offices (and I'll leave my opinions on whether they are good for productivity or not to myself), so being able to drown out the din is always essential.
When I'm not using podcasts to drown out the noise, I usually use Japanese Rock music. The sound-scapes that artists like L'Arc~en~Ciel, Gackt, Radwimps, and One OK Rock tend to create are full enough that they block out most of the sound of people shouting at reach other, or barking down the phone at each other.
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