Imagine Person 1 and Person 2 are singing a duet; Person 1 is singing like an angel, while Person 2 is having voice cracks every two seconds.

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"You're the perfect melody~" Person 1 sings. "AnD tHe OnLy HaRmOnY!!!!" Person 2 screeches out. Person 1 stares for a moment. "Why do I feel like I should be sca-"
They're cut off by Person 2 screaming at the top of their lungs, "I wanna heeeEEEEEEAAAAAAAAAAAAAA!" It was enough to make Person 1's ears bleed, as well as any glass objects in the room shatter.
"...I really need to get you some singing lessons."