Definition of "mellifluousness"

"You should read Spanish," he said. "It is a noble tongue. It has not the mellifluousness of Italian, Italian is the language of tenors and organ-grinders, but it has grandeur: it does not ripple like a brook in a garden, but it surges tumultuous like a mighty river in flood."

1915, W.S. Maugham, Of Human Bondage