Koch’s first task is not to invent more notes, but to hear why similar harmonic arrivals can carry very different formal weight.

For Koch, an I phrase and a tonic cadence may both arrive on the tonic triad, yet they do not say the same thing. A phrase ending creates a local resting point; a cadence uses a fuller closing formula, usually reinforced by decisive bass and soprano motion. The same distinction applies to a V phrase, which ends on the dominant without producing complete closure.

In Koch’s Example 229, a Haydn minuet in G major, the first phrase ends on G and functions as an I phrase. The second reaches a stronger tonic cadence, with 5–1 motion in the bass and an octave in the outer voices. The third closes on D as a V phrase, and the fourth returns to G with the final cadence, creating a clear hierarchy of musical punctuation.

Examples 232–234 complete Koch’s four basic arrangements when phrases two and four cadence in the principal key: I–cadence–V–cadence, V–cadence–I–cadence, V–cadence–V–cadence, and I–cadence–I–cadence. The last is the most uniform because every caesura rests on the tonic triad, and Koch warns beginners that such repeated arrival can easily sound monotonous.

Once the punctuation is clear, Koch turns to a second puzzle: how can four phrases sound varied while still belonging unmistakably together?

Example 229 is striking because nearly the whole minuet grows from one principal idea. The opening phrase is redirected, reharmonized, and reshaped into later endings rather than replaced by unrelated material. Through altered direction, passing modulation, and even contrary motion, Koch shows that formal variety can arise from transformation while the piece preserves unusually strong unity.

Koch does not demand that every four-phrase piece derive from one phrase. Example 230 uses two related ideas, preserving rhythm and imitation while changing pitches and destinations. With three distinct phrases, as in Example 231, the final phrase should clearly return to earlier material. This rhetorical return of the opening restores coherence after the introduction of something genuinely new.

Phrase labels must always be heard within the active tonal region. An ending may be an I phrase in a temporary key even if that chord serves another role in the principal key. In short two-phrase second periods, modulation is usually only passing; longer spans allow cadential confirmation elsewhere and a later return. Punctuation is therefore contextual function, not chord naming.

For Koch, punctuation is not merely analytical vocabulary; it trains the ear, the imagination, and the composer’s control of musical direction.

Koch expects the student to invent a short melody without an instrument, hear it inwardly, and notate it accurately before testing it at the keyboard. The goal is to strengthen inner hearing rather than mechanical trial and error. A four-measure phrase conceived in this way can become the seed of a whole piece, provided its harmonic implications are already sensed as part of the invention.

This leads to one of Koch’s strongest principles: melody and harmony should be conceived together. Even a two-voice texture may imply a fuller four-part harmony beneath the surface. That outlook differs from some Renaissance practice, where two voices can form a complete contrapuntal texture in themselves. Knowing both approaches prevents eighteenth-century habits from being imposed on every repertory.

Koch’s lesson is practical: compose by controlling degrees of closure, not by merely counting phrases. Reuse material, redirect it toward new goals, and let local keys reshape the meaning of I and V. The smallest dance can then teach thematic economy, modulation, and formal balance. Musical punctuation becomes a tool for composition, analysis, and improvisation, not a set of labels to memorize.