"Margretta Beaty’s Tosca exploited the extraordinary power of her voice to create an imperial Tosca not much different from Lady Macbeth or Medea. She could summon a steely tone able to shake soldiers in their boots, then fade it into loving warmth at the right time. That range of emotionally evocative vocal capability is rare on any opera stage." 

                                                            

                                                             --James Prichard, published in The Boston Musical Intelligencer