Check out this awesome animation for the London Business School for their 2014 Global Leadership Summit! The dubstep beat you hear in the background can be licensed here.
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You don’t need anything. You can achieve incredible mixes on your white iPhone earbuds for all I care, given that you understand their frequency response (what they sound like at each crucial frequency bands). So my short answer to the question in the title is: headphones. Plain and simple. Oh… and here are 5 reasons why.