Arthur has started singing duets with me
I sing to the kidcats ALL the time. They each have their own special song and I just make some up as I go. And, yes, I sing to the outdoor kidcats, too.
Yesterday I was singing to Arthur and he joined right in! He's such a sweet boy.
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Most of them are just changed lyrics from other songs but some I made up on my own. In the morning, I just need to say "Char Char song" and my Charlie runs to the bedroom and onto the bed then flops on his back for a tummy rub while I sing. My favorite part of the morning. 
I called mine would not allow me to sing at home. She'd sit on my toes and bite me if I didn't stop immediately on demand. Didn't matter that I was part a a classical vocal ensemble, she was not having it in our house. So I had to do all my rehearsing when she was outside somewhere or at a practice hall on campus.
It makes me wonder what is really going on in their heads when they are freaking out about their human singing.
When I sing, she looks at me like she thinks I've lost my mind! 
I think I need to do it more often, so she can get used to it. I like the idea of picking out a special song for her and singing it to her repeatedly. Gonna have to give that some thought!
I used the phone wake up music once.
"Kit kit kitty cat
Kit kit kitty cat
That's the sound the phone makes
When it wakes my kitty up"
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I ask questions & she meows back, & we go back & forth. We've had lengthy conversations about a wide variety of topics.
