In a 1985 book, Gary Provost created this tour de force to demonstrate what happens when the writer experiments with sentences of different lengths:
“This sentence has five words. Here are five more words. Five-word sentences are fine. But several together become monotonous. Listen to what is happening. The writing is getting boring. The sound of it drones. It’s like a stuck record. The ear demands some variety.”
“Now listen. I vary the sentence length, and I create music. Music. The writing sings. It has a pleasant rhythm, a lilt, a harmony. I use short sentences. And I use sentences of medium length.”
“And sometimes, when I am certain the reader is rested, I will engage him with a sentence of considerable length, a sentence that burns with energy and builds with all the impetus of a crescendo, the roll of the drums, the crash of the cymbals — sounds that say listen to this, it is important.”
So write with a combination of short, medium, and long sentences.
Create a sound that pleases the reader’s ear.
Don’t just write words. Write music.
Quoted in 50 Writing Tools by Roy Peter Clark