Writing one great and masterful sentence is no small feat, but accomplishable with time. With every word known to the writer, and the combinations those words bring, crafting a single thought that is both profound and witty can be done.
The dividing line which separates a well known author and a journaling school boy is the stamina to continue on beyond that one sentence, perfecting line after line until the combination of words are endless and time no longer a factor. Only then is it known that a wistful, elating story is not by luck or chance, but only done by skill.
It's possible that no melody has been unheard, but some artists can make several familiar chords seem fresh again. Fidgeting with the poetry of the lyrics until they match the tone and essence of the music is a skill only given to a few. To have a golden song reach the masses, being sung by every store around is a moment of accomplishment. That moment, however, would not fall on the side of greatness. The separating line is not a hit song, or even a few, but mountains of vinyl that bled in battle as timelessness fought for song after song, note after note.
The reason few are great and not most is not a secret, it's a mystery.
To take an idea, no matter the medium, and effectively and thoughtfully communicate it with another is a beautiful thing. Not something that makes a few great and others not so great, but a beauty that revels greatness to the rest.