Bach’s Prelude and Fugue in C Major: From a River of Harmony to a Four-Voice Conversation

A Listening Map of 50 Piano Works · Article 1

Bach’s Prelude and Fugue in C Major, BWV 846, opens Book I of The Well-Tempered Clavier. Usually lasting only four to six minutes, it introduces two very different ways of listening: following harmonic movement in the Prelude and tracing a recurring subject through several voices in the Fugue.

The coordinates

• Composer: Johann Sebastian Bach
• Work: Prelude and Fugue in C Major, BWV 846
• Collection: The Well-Tempered Clavier, Book I, 1722
• Listening words: harmony, bass, subject, density

First stop: the Prelude—a constant surface over a moving riverbed

Almost the entire Prelude uses the same broken-chord pattern. Its surface sounds calm and regular, yet the harmony underneath changes nearly every bar.

On a first hearing, do not search for a conventional melody. Listen instead to the lowest note of each pattern. As the bass moves, the centre of gravity moves with it.

The opening C major is clear and stable. Gradually, shadows, suspensions and dissonances enter the harmony. The pattern remains unchanged, but its emotional meaning shifts from security towards tension. When C major finally returns, it no longer feels like the untested calm of the opening; it feels like a destination reached after travel.

Second stop: the Fugue—recognise the subject, then hear it approach

The Fugue begins with one voice stating the subject alone. There is no need to memorise every note. Notice its direction and rhythmic outline.

Other voices then enter, carrying the same subject in different registers. On a first hearing, give yourself only one task: try to recognise the first four entrances.

As the Fugue develops, the entrances draw closer together. At times, one voice begins before another has finished. These overlaps increase the density and propel the music towards its climax.

A three-listening method

1. First hearing—contrast: Hear the Prelude as flowing harmony and the Fugue as an expanding conversation.
2. Second hearing—bass and subject: Follow the Prelude’s lowest notes, then identify the returning subject in the Fugue.
3. Third hearing—the performer: Does the pedal blur the harmony? Does the tempo leave all four voices audible? Is the climax gradually prepared or suddenly imposed?

A common misunderstanding

The Prelude is not merely peaceful background music, and the Fugue is not merely mathematical construction. The Prelude’s drama lies in changing harmony; the Fugue comes alive through waiting, answering, pursuit and overlap between voices.

Before listening again

Take three questions with you:

• When does the brightness of C major first acquire a shadow?
• Can you recognise the Fugue’s earliest subject entries?
• How does the performer make the final return sound conclusive?

This piece offers a listening method that applies far beyond Bach: first identify what remains constant, then listen for what is changing.

Suggested Listening

Sviatoslav Richter performs Bach’s Prelude and Fugue in C Major, BWV 846 (YouTube)

This complete piano recording includes both the Prelude and Fugue, making it suitable for following the two-part listening map above.

If you would like to bring these ideas about listening, understanding, and practice to the keyboard, you might try ScoreFlow, an app I developed to make score reading and daily practice flow more naturally together.