Sentence:  [O]ne finds patients unable to take a single step, who can dance with consummate ease and grace; patients unable to <WSD>phonate</WSD>, or utter a single word, who can sing without any difficulty, bringing to the music all the volume, all the richness and delicacy of intonation, all the feeling, that it demands. 
Meaning of the word marked with <WSD> tags:  To make sounds with the voice.