I believe in singing out loud. I think it's good for the soul.
I happen to have two children and a husband with strong vibrant singing voices and an ear for pitch (my singing voice is passable and my pitch is questionable, but I don't care) which makes it hard for them to let me sing along sometimes. But I sing along anyway and do you know what I tell them? I tell them I have to, because it feels good.
And it does.
There's a reason we roll down the windows and crank up the volume and sing along when our old favorites come on the radio on the drive home from work or dropping the kids off at school or lunch with a friend or target.
Think about prayer in the house of worship, about the melody that accompanies the words, and the way that folks in the pews sing-along. I don't think that's an accident. and seventh inning stretch at the baseball game, when the whole crowd stands up to sing "Take Me Out to the Ballgame"or "Country Boy" or "Sweet Caroline" or whatever the tradition is in your ballpark, and people don't just sing-along, they sing out.
Singing releases endorphins, but the science isn't important to me because try it. It's good for the soul.