But just as they reached the door there came the unmistakable sound of feet in the passage.

Her ears finally caught the unmistakable sound of running water.

Listen, and you can hear that unmistakable sound all over rock history.

Then he heard it again, a slight but unmistakable sound from next door.

But now he could hear the unmistakable sounds of someone moving around.

The words weren't clear, only the unmistakable sound of a conversation.

Suddenly, from another floor, came the unmistakable sound of someone else playing the piano.

And then I heard the unmistakable sound of a local rock station.

Paul had been standing watch a few minutes earlier when he heard the unmistakable sound of big engines.