Singing makes you happy

Of course we all think it, but here's some other opinions on the matter.  This one comes from England, where apparently everyone wants to be a singer:

http://www.telegraph.co.uk/health/wellbeing/5050461/Why-singing-makes-you-happy.html

Here's another article from the US:

http://health.howstuffworks.com/human-nature/emotions/happiness/science/singing-happy.htm/printable

And here's yet another:

http://www.streetdirectory.com/travel_guide/37761/hobbies_for_the_family/recreational_singing_may_make_you_live_longer.html

Just goes to show you that not only is singing a worthwhile pursuit for it's own reasons, but it can actually have serious benefits for your long term happiness and health!

Why wouldn't anyone want to sing?