Andreas Creten, co-founder of madewithlove, wrote a good blogpost about a few aspects of their company culture.
There are three requirements for making good products: developers with the right skills, decent product management and ideal working conditions. The reason why so many of us wear headphones has to do with the latter. As a software developer, the last thing you want is distraction: colleagues talking to each other, the sound of a coffee machine, a printer and so on. Distraction prevents you from getting “in the zone”, a state of mind in which you deliver your best work.