virtuosa 
••••• Shattering Crescendo - p454
Most of the low-level Melpominee powers can only be used on one target at a time. When the Daughter reaches this level of mastery in her Discipline, she can "entertain” a wider audience. Each member of the audience hears the same message.
The Siren toggles the ability, augmenting the function of •• Phantom Speaker and •••• Siren's Beckoning