Melody lets out a fart directly into the mouthpiece of the tuba, laughing because the sound of the fart, now amplified and modified by the acoustics of the tuba, would resonate in a deep, brassy and possibly distorted manner, turning a simple bodily function into a bizarre musical note or chord since it was the kind of thing that would turn the ghastly gassy ghost girl on. "Ooh that 1 really reeked; good thing it's lingering longer than I expected it to since I got way more to provide!" And thus did she resume her ass ripping into the scented musical object.