Quote from : A Dash of Style: The Art and Mastery of Punctuation Book

There is an underlying rhythm to all text. Sentences crashing fall like the waves of the sea, and work unconsciously on the reader. Punctuation is the music of language. As a conductor can influence the experience of the song by manipulating its rhythm, so can punctuation influence the reading experience, bring out the best (or worst) in a text. By controlling the speed of a text, punctuation dictates how it should be read. A delicate world of punctuation lives just beneath the surface of your work, like a world of microorganisms living in a pond. They are missed by the naked eye, but if you use a microscope you will find a exist, and that the pond is, in fact, teeming with life. This book will teach you to become sensitive to this habitat. The more you do, the greater the likelihood of your crafting a finer work in every respect. Conversely the more you turn a blind eye, the greater the likelihood of your creating a cacophonous text and of your being misread.