Audio Voyeur Moment: On conveying ideas & concepts

Snippet of conversation overheard at Starbucks: two college-age girls discussing a certain writing class, and on the fickle art of conveying one's ideas & concepts to the reader:

Girl 1: "[Writing] kindamaybesorta seems like when you tap your fingers to a song playing in your head: y'know, You can hear the melody in the tapping."

Girl 2: "Yeah! I always wondered if anyone else could hear that."

Girl 3: "Mm-hmm. And you can sit there and tap out Flight of the Bumblebee, hearing all the horns and violins and drums and cymbals, all coming from your fingertips on the countertop!"

Girl 2: "But all the rest of us just hear tap-tap-tap.

Girl 1: "That's what it seems like to me."

Girl 2: "Me three."

(Me thinks Girl 1's already found the key.)