I know what you are thinking...maybe I just have an awful voice that can't carry a tune and that distresses all animals and humans... and in part, you would be correct. I have a horrible voice, but I love singing so I do it anyway. But my DH has a lovely voice. Harley gets "the frown", cocks her head and comes to us to see " what is wrong". And we sing and hum often and she does this every time. DH has a theory that perhaps she thinks we are in pain? But as I mentioned that may ring true for me, but not for him but her ears hear different things. We are always playing music in the house, quite loudly sometimes and she will calmly lay around or sleep through it. She only responds with her "Little Timmy is down the well" expression if we personally sing or hum. Does anyone else have this? Or can someone offer an alternate or expanded theory?