A Fascinating Thing Happens to the Heartbeats of Choir Members When They Sing

... which, for example, affects our vocal timbre. Songs with long phrases achieve the same effect as breathing exercises in yoga. In other words, through song we can exercise a certain control over mental states," BjA rn Vickhoff, the study's lead ...

http://www.theblaze.com/stories/2013/07/11/a-fascinating-thing-happens-to-the-heartbeats-of-choir-members-when-they-sing/