It's a blue world without you.

[trof]

The Four Freshmen.
Our late (great) German Shepherd, Nasha, would "sing" the first 4 or 5 bars of this every time I played the CD.
Ahhhwooooooooo

The only other thing she ever sang to was the Andy griffith Show theme. I think it was the whistling that set her off.

Oh, yeah. The Lyrics to Blue World.
Tearjerker.

It's a blue world without you,
It's a blue world alone
My days and nights
That once were filled with heaven,
With you away how empty they have grown
It's a blue world from now on
It's a through world for me
The sea, the sky, my heart and I
We're all an indigo hue,
Without you, it's a blue, blue world