And what a change of tone from the old man.

When they realize who I am, the whole tone changes.

He went on without a change of tone or expression.

Rather, the work held the attention with its constant changes of tone.

Once inside, the tone changes somewhat, but not a lot.

There was a pause, just long enough to mark a change of tone.

There was a very subtle change of tone in his voice.

Tom heard the engine's tone change as the vehicle came to a stop.

He spoke again, his words accusing, even though they showed no change of tone.

And then, without change of tone, he said, "How often have you killed?"