How can I keep from singing?

When I am stressed, I get out Horatio, and I sing. It makes me instantly relaxed. I've been thinking a lot about music lately, and here are some good quotes I found...

Some days there won't be a song in your heart. Sing anyway. ~Emory Austin

So she poured out the liquid music of her voice to quench the thirst of his spirit. ~Nathaniel Hawthorne

As long as we live, there is never enough singing. ~Martin Luther

You don't love someone for their looks, or their clothes, or for their fancy car, but because they sing a song only you can hear. ~Author Unknown

Through all the tumult and the strife

I hear the music ringing;

It finds an echo in my soul—

How can I keep from singing?