They consider it cruel and unusual punishment but I just can’t stop.

...or she's trying to sing along. She shows up meowing loudly, and one time nipped me on the chin while I was playing my flute. She does the same thing for singing from a TV show or YouTube video, but only for female voices.

and she would meow after every line. I never did figure out if she was singing along or telling me to shut up!

I use existing music

One of our cats is a recluse. Her name is Ellie, and I have sung "Eleanor Kitty sits by herself on the big water bed"
and "Ellie Belly, you're the one"

There are others but it's 1:00 am and I can't think of much

Thanks, yellowdogintexas!

And I get slow eye blinks in exchange.

I pull him under the covers at night, when he is cold.

I hold him tight, and he goes limp and rattles in the chest.

And this is a cat that wandered in off the street one day, some 5 years ago.

Pets make our lives better. No matter the circumstances. Simple!

the only reason I'm not writing songs to & about cats is my lack of a cat...
over the years, when the critter's life comes to an end, it just about kills me. so I'm limited to neighborhood cats & friends who have cats - IOW, cats at a distance.

I make up silly songs that rhyme. It's funny now that you mention it, I've only ever sung for my girls, not one for the boys.
I guess my Petunia for 14 years and my Pookie for another 15 years from late eighties to early aughts.
I do talk to Cuddles when we walk, and Moofy Moo, and Nugget too when I go back and visit them at Toby's moms house.

I often sang to my dogs. They seem to "like" it. My cats looked at me as if I was crazy, though.

We got a rescue beagle, maybe 25 years ago, she was sick and weak and the vet said she'd probably die. I sat up with her all day and night for a week or more making up nonsense songs about her name, Sarah.

She lived a productive life but I miss her to this day.

I sang to my dogs while we played and, much more sadly, when they were old and dying.

I used to pet and play with them while singing "She Rubs You (Yeah Yeah Yeah), PS, I Rub You, and "Rub Me Do" and other such "rub" songs by the Beatles.

They're all gone now and we're old and lonely.

I had a sweet boy named Teo (tay-0), so ... TE--O, Te-eh-eh-eh-o, Daylight come and the kitty come home!

Every night, I would hold the cell up for her to be sung to. She would go to the phone and rub the phone while S. was singing the song.

Thank you for sharing that story.

When I sing because he comes running in and jumping up on my lap and putting his paw on me in support.

I didn't think it was that bad. Everyone used to tell me I had a pretty singing voice.