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The Ursatz (original form) is the deepest level of musical structure in Schenkerian analysis, consisting of a specific progression from the tonic through a structural dominant and back to tonic, typically as a simple melodic descent (3-2-1) in the upper voice. All tonal music derives from this fundamental structure through layers of elaboration and prolongation.
In Schenkerian analysis, every tonal piece exists simultaneously at multiple structural levels. You already know from your study of Schenkerian analysis and voice leading that the foreground is the surface of the music — the actual notes you hear. Deeper levels strip away embellishments to reveal skeletal harmonic and melodic progressions. The Ursatz ("original form" or "fundamental structure") is the deepest of these levels, the irreducible skeleton from which all tonal music is derived by elaboration. It is not an abstraction invented to describe music — Schenker argued it is the unconscious generative structure underlying all tonal composition.
The Ursatz has two interlocking voices. The upper voice carries the Urlinie (fundamental line): a stepwise descending melody from a structural head tone — typically scale-degree 3, 5, or 8 — down to scale-degree 1. The most common form is 3-2-1: the melody begins on the third scale degree, passes through the second, and resolves to the tonic. The bass voice carries the Bassbrechung (bass arpeggiation): the bass moves from the tonic up to the dominant and back to the tonic, outlining the fundamental I–V–I harmonic trajectory. These two voices combine to form a contrapuntal structure your voice-leading training makes legible: the Urlinie's 2 over the dominant bass creates a consonant harmonic context (the V chord), and the resolution 2→1 arrives with the return of the tonic bass.
The power of the concept is what it explains about musical elaboration. The I–V–I Bassbrechung can be prolonged into any surface harmonic progression: a I–IV–V–I progression elaborates the I–V–I by prolonging tonic and preparing the dominant. A lengthy development section of a sonata elaborates the structural dominant before the return to tonic in the recapitulation. The Urlinie's stepwise descent can be dramatically delayed — the structural 2 might be prolonged for dozens of measures — but it must eventually descend to 1 to close the structure. Schenker called any music that does not complete this motion "open" or "incomplete," a strong structural judgment.
The Ursatz also explains why tonal music has such a strong sense of direction and inevitability. Every foreground ornament — every passing tone, suspension, neighbor figure, arpeggiation — is a prolongation of some deeper-level note. You hear the surface because it is interesting; you feel the momentum because the underlying structure is pulling toward its conclusion. Learning to reduce a piece to its Ursatz is learning to hear what Schenker called the "background" — not what happens in time, but what is structurally at stake. The descent from the head tone to scale-degree 1 is not just a melodic ending; it is the resolution of the entire piece's fundamental tension.
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