This is high-brow art music, and so it is proper to hide behind a made-up Italian word like Expletivo, but the essence of this movement might be better expressed through the Polish idiom for swearing, which is “to throw meat”. Expletivo is vulgar. It should be bleeped out and cleaned up. Listener discretion is advised.
About Three Monologues: I have always been fascinated by the ability of many actors to portray contrasting emotions at the drop of a hat. Those with many years of experience and a full control of their bodies, are able to switch seamlessly between tearful sobbing and stupefying laughter. Often, when called to audition, they are required to recite short monologues showcasing their abilities. Surge, Cantabile, and Expletivo portray a wide range of human emotions, from conflicting, dissonant, and aggressive, through delicate, fragile, and innocent.