To Billy, too, it was new (and interesting) to hear her own voice blending with another's so perfectly--to feel herself a part of such exquisite harmony.
"Oh, oh!" she breathed ecstatically, after the last note of a particularly beautiful phrase.

"I never knew before how lovely it was to sing duets." "Nor I," replied Arkwright in a voice that was not quite steady.
Arkwright's eyes were on the enraptured face of the girl so near him.
It was well, perhaps, that Billy did not happen to turn and catch their expression.

Still, it might have been better if she had turned, after all.

But Billy's eyes were on the music before her.

Her fingers were busy with the fluttering pages, searching for another duet.
"Didn't you ?" she murmured abstractedly.