Well, if you pair a merperson playing an instrument with another one who's singing, they could nearly be unstoppable. And just because we have this kind of power doesn't mean we never get tired of singing...our throats get sore, too, and sometimes we even lose our voices.

[Kay idly strokes the detail in the mermaid statuette's hair with a finger.]

And since the power comes from within us, we can't use instruments like...um, drums or violins or cymbals.