http://online.wsj.com/article/SB10001424127887323735604578440851083674898.html?mod=e2fb#project%3DHOWYOUREALLYTALK0423%26articleTabs%3Darticle

This article from the Wall Street Journal offers new evidence that tone of voice can greatly affect one’s career, and it also advocates getting voice coaching.  There’s also a fun graphic, showing different types of vocal sound, aligning with a celebrity.