My cat in middle school, learned that yelling “hello” at doors means someone would let you in. She stopped doing it as often when it didn’t work consistently but she still knew how to say hello if you said it to her or she wanted in a room
Being a fan of cats for over 5 decades now, I thought I’d heard everything but that cat mimicking you @ 0:25 was remarkable. I know that cats and other animals appreciate and even enjoy music and you singing to them, but that was something else.