Sing like no ones listening?

So this is our singing neighbor. He lives somewhere on our street and is constantly walking up and down the block...singing...LOUDLY. The first few times I noticed, I just stood in the window watching in amazement. "Doesn't he know that EVERYONE can hear him???" I'd say to the boy. "I'm sure. Maybe he doesn't care?" he said. So I've been trying to catch him on video but every time I do, he either walks to damn fast or stops singing. FINALLY! I got a little blip. He sings everything from Christina Aguilera, Beyonce, Sam Sparro to Rihanna and Brittany. Mostly pop queens apparently.

I can't decide if I'm perplexed or if I admire his courage to not care who's watching. Is this what they mean when they say, "dance like no one's watching," ???? Yes I have to much time on my hands.