Singing like no one is listening means expressing ourselves without worrying what others think about us. To be able to do this has been a process of growth for me throughout my life.
As a girl growing up in our patriarchal world I was taught by that world to sacrifice my own needs and wants in caring for others. I was also taught that this would make me acceptable, likeable, even loveable, and of course this mattered to me.
I am a rebel, though, and a thinker, or maybe a rebel as a result of being a thinker. So I became a feminist at a very early age. That means I was also one of the early feminists. Early feminism was about equal rights.
As a thinker I decided I would set out in the world to earn those rights. And I did, by working a man's job, doing it well, making a man's pay, and gaining the respect of the men working with me. I worked surrounded by men. I got along with all of them and many became my friends.
I didn't love the work though I did love aspects of it. Mostly, I loved being on equal footing with good men. For 20 years my voice was feminism. But I didn't shout about feminism. I sang my feminism by being that change which I wanted to see in my world.
After a while, I still did hit the proverbial glass ceiling, but I didn't see it as having to do with me being a woman. I had not qualified myself to move beyond middle management. Along the way I had instead found something else I wanted to do, a deeper and richer level of voice. I had learned there was a spiritual reality beyond the physical one we see. That generic spirituality became the song I wanted to sing.
I've worked 20 more years now, learning about spirit (and Spirit and so on) as well as teaching others who also want to learn about it. I don't shout about spirituality either. Spirituality is an awareness not a religion. I simply sing about the reality spirituality helps me see.