She might be, and certainly was, vulgar; but she could play well and she knew good music.

People generally think that good music softens manners, and does not permit those who play and practice it to be vulgar.

But, concerning this young person, so much could not be said with any truth.
"You play very well.

Where did you learn?
Who was your master ?" Arnold asked.
She began to reply, but stopped short.

He had very nearly caught her.
"Don't ask questions," she said.