mellifluous

sulosointuinen Flowing like w:honey honey.
Sweet, smooth and musical; pleasant to hear (generally used of a person's voice, tone or writing style).
1915, w:W. Somerset Maugham|W.S. Maugham, "s:Of Human Bondage/Chapter LXXXVI|Of Human Bondage":

"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."