Here's the deal
"The neuroscience of singing shows that when we sing our neurotransmitters connect in new and different ways. It fires up the right temporal lobe of our brain, releasing endorphins that make us smarter, healthier, happier and more creative. When we sing with other people this effect is amplified."
You can find the whole article HERE.
And for those of you who think that unless you sound like Adele you "can't sing," then let me introduce you to Bobby McFerrin.