It was still uttered in moanings and angry ejaculations; but the former, instead of appearing distant and long-drawn as before, were now heard more distinctly; while the latter, becoming sharper and of more angry intonation, were not pronounced as before in monologue, but in two distinct voices-as if at least two individuals were taking part in the indignant Duetto!
"The White Gauntlet"
Mayne Reid
One little burn of my acquaintance, which runs through field and dell to join the Till, I have hearkened to again and again for hours, unable to break away from the spell of its ever-varying, yet constant music-a sort of wilder, sweeter version of Mendelssohn's Duetto, with the voices of Knight and Lady alternating and intermingling amidst a rippling current of clear bell-like undertones.
"Northumberland Yesterday and To-day"
Jean F. Terry
They answered him in agitated Duetto.
"The Mayor of Troy"
Sir Arthur Thomas Quiller-Couch