— Matthew Roderick (@tazyMatt) September 11, 2016
— Jeremy Crawford (@JeremyECrawford) September 12, 2016
That doesn’t make sense, the voice is an instrument. The music definition of instrument is an object or device for producing musical sounds. The rule on a bard's spellcasting focus (PH, 53) refers to the sorts of musical instruments that appear in the PH equipment chapter.
— Jeremy Crawford (@JeremyECrawford) September 11, 2017