Admittedly, in-ear earphones drip a level of professionalism that over-the-ear headphones simply can't. But certainly they do not do so in every office or work situation. Outside of a few, special cases, I call BS on this Westone article. Listening to earphones can focus you. There is no doubt of that. But they also tend to focus you like blinders do a horse, and not always in the way your boss/customer intends.

Enjoy your Bieber, but I'd check with your boss and co-workers before closing the world off with a great set of Westone or Jerry Harvey, or FitEar earphones. And for the love of god, stave off the desire to put anything Beats in your ears.