Sentence:  For an instant John longed for the sound of the bells of Noyon-la-Sainte , the touch of his mother 's hand , the lilt of Charles 's voice in the square raftered rooms , his father 's <WSD>bass</WSD> tones rumbling to the canons , and the sight of the beloved bishop . 
Meaning of the word marked with <WSD> tags:  the lowest part in polyphonic music