Truth be told -- it wasn't just ANY song the hubby was crooning. It was that old 1909 song, "My Wife's Gone to the Country (Hurrah! Hurrah!)." Music by Ted Snyder, with lyrics by Irving Berlin and George Whiting.
Here's an excerpt:
My wife's gone to the country, hurrah, hurrah!
She thought it best, I need a rest, that's why she went away
She took the children with her, hurrah, hurrah!
I don't care what becomes of me, my wife's gone away
Advice to you gents out there. Look the song up on YouTube, listen, and enjoy. One caveat. If you value your life and well being, listen to the song when the missus isn't around.