The harpsichord, the organ, and the instruments of the Baroque

The problem of the lost sound

There is a paradox at the heart of Baroque music: it is one of the most thoroughly documented periods in musical history — thousands of scores, treatises, instrument inventories, paintings showing musicians at work — and yet for centuries it sounded radically different from the way we imagine it today.

For much of the nineteenth century and the first half of the twentieth, the works of Bach, Handel, and Vivaldi were performed on modern instruments: grand pianos instead of harpsichords, violins strung with metal instead of gut, orchestras of eighty players where the original forces would have numbered twelve. The result was perfectly valid music, but music that sounded more Romantic than Baroque. The nuances, textures, and specific colors that Baroque composers had in mind when they wrote had disappeared beneath layers of modernization.

It was from the second half of the twentieth century onward that the historically informed performance movement undertook the task of recovering those sounds. Reconstructing instruments from original models, studying period treatises, unlearning centuries of pedagogical tradition. The result was revelatory: the same score, in the hands of the same musicians, sounded different. Lighter, more articulate, more alive in some respects, more austere in others.

To understand that difference, you need to understand the instruments.

The harpsichord: the string-plucking machine

The harpsichord — clavecin in French, clavicembalo in Italian — was the dominant keyboard instrument in Europe from the fifteenth century well into the eighteenth. It is the direct ancestor of the piano, but it works in a completely different way.

In a piano, the player strikes the strings with felt-covered hammers. The force applied to the key determines the volume: playing hard produces a loud sound, playing softly produces a quiet one. In a harpsichord, the strings are not struck but plucked by a small tongue of quill — originally from a bird's feather, today often plastic — called a plectrum. The mechanism is all or nothing: the string is plucked or it is not, but the force applied does not change the volume. A harpsichord always plays at the same dynamic level, regardless of how much pressure the player exerts on the key.

This limitation — which from a Romantic perspective might seem like a deficiency — completely defines the harpsichord's expressive language. Because volume cannot be varied by touch, expression is built in other ways: through articulation (how notes are separated and connected), ornamentation (the trills, mordents, and appoggiaturas that embellish the melodies), phrasing, and tempo. Bach, Couperin, Rameau, and Scarlatti did not think in terms of crescendos and diminuendos: they thought in textures, in colors, in the interplay between the different layers of the counterpoint.

The most elaborate harpsichords had two superimposed keyboards — called manuals — and several stops that could be engaged to change the timbre: one stop might sound strings of a different length, producing octaves or brighter or more velvety tones. A skilled harpsichordist could draw on a considerable palette of tonal colors, though always within a narrower dynamic range than the piano. The harpsichord also has a physical presence the piano does not: it is a bright, incisive instrument that projects sound directly. In a Baroque room — wooden, relatively small, without the acoustic absorption of the great nineteenth-century theatres — that sound filled the space with a clarity the piano can sometimes not match.

The organ: the cathedral within the cathedral

If the harpsichord was the domestic and chamber instrument of the Baroque, the organ was its architectural counterpart: an instrument that could not exist without a building to contain it, and that in turn transformed the building into an instrument. The pipe organ works on a simple principle: pressurized air passes through pipes of different materials and lengths, producing sounds of different pitches and timbres. But the simplicity of the principle conceals a formidable mechanical complexity: a medium-sized Baroque organ might have two or three thousand pipes, several manual keyboards, a pedalboard played with the feet, and dozens of stops — levers or buttons that activated different groups of pipes — which the organist could combine to obtain endlessly varied sonorities.

The great German and Dutch Baroque organs of the seventeenth century are considered among the most complex instruments humanity has ever built. The organ of the Marienkirche in Lübeck, where Buxtehude played and where Bach traveled to hear him, had more than four thousand pipes. The one in Haarlem Cathedral, built by Christian Müller in 1738, had five thousand. These instruments were not merely musical tools: they were engineering projects involving carpenters, blacksmiths, painters, and mechanics for years, and once installed they defined the sonic identity of a city for centuries.

The relationship between the organ and the acoustic space of the church is something anyone who has heard an organ in its original context can feel but is hard to put into words. The sound does not come from a single point but from everywhere; it fills the space, bounces off the walls, mingles with itself in the air before reaching the ear. It is a physical as well as a musical experience. Baroque composers knew this, and wrote for that effect: Bach's organ music, played on a Baroque organ in a stone church, sounds fundamentally different from the same music on a modern organ in a concert hall. Neither is better: it is a different instrument, in a different space, producing a different experience.

The Baroque violin: gut strings and a convex bow

The violin has existed since the mid-sixteenth century, but the Baroque violin is a significantly different instrument from the modern one, though they look almost identical from the outside.

The Baroque violin's strings are gut — treated and twisted sheep intestine — not metal or metal-wound synthetic core. Gut strings produce a warmer, rounder sound, with less brightness in the upper harmonics but a richness in the midrange that modern strings do not have. They are also more sensitive to humidity and temperature, making the instrument harder to keep in tune but also more organically responsive to variations in bow pressure.

The Baroque bow is convex — it curves outward, in the opposite direction to the modern bow, which is concave — and lighter. This completely changes the relationship between the player and the instrument: the Baroque bow naturally tends to produce a sound that diminishes from the heel to the tip, while the modern bow allows more even pressure throughout its length. A Baroque violinist uses that structural characteristic of the bow as an expressive tool, not as a limitation to overcome.

The chin position also differs: Baroque violinists did not always use a chin rest — which was introduced later — and held the instrument in different ways, allowing greater freedom of body movement but requiring a different technique for fast passages.

The lute and theorbo: the bass of the sound world

Before the piano existed and before the cello assumed its current role, there was another instrument that defined the sound world of European chamber music: the lute. And its larger sibling, with its enormously long neck and added bass strings: the theorbo.

The lute is a plucked string instrument with a history rooted in the medieval Arab world — the word comes from the Arabic al-'ud, simply 'the wood' — and that in the Renaissance and early Baroque was the most highly prized instrument in all of European chamber music. Monarchs, aristocrats, and professional musicians played it; lute masters were figures of enormous social prestige. In the Baroque, the lute and theorbo took on a fundamental structural role: together with the harpsichord and the cello, they formed the basso continuo, the harmonic foundation on which all the music was built. The basso continuo is one of the most important concepts of the period: the composer wrote a bass line and figures indicating the chords, and the player improvised a complete harmonic realization from those indications. It was, in a sense, the forerunner of the jazz lead sheet: a framework that leaves room for the performer's creativity within a defined structure.

The theorbo, with its additional bass strings on a second neck, added depth and range to the continuo, and its sound — warm, resonant, with a surprising projection given its fragile appearance — is one of the most distinctive and beautiful timbres in all Baroque music.

Wind instruments: wood and brass before the key system

The wind instruments of the Baroque are perhaps the ones that differ most from their modern equivalents.

The Baroque transverse flute was made of wood, usually boxwood or ebony, with a single metal key for the lowest note. It lacked the key system that Theobald Böhm would develop in the nineteenth century and that all modern flutes now use. This meant that some notes were 'better' than others in terms of tuning and projection, and the player used special fingerings and variations in embouchure angle to correct small imprecisions. The result was an instrument with a characteristic tonal personality in each register: dark and dense in the low notes, bright and somewhat fragile in the high ones.

The Baroque oboe had a thicker reed than its modern counterpart, producing a more nasal, penetrating sound with a more pronounced articulation. The natural horn — without valves or keys — could only play the notes of its fundamental's natural harmonic series: this dramatically limited its range in the low register but produced in the high register a clarity and brilliance that the modern horn rarely matches. Baroque horn players specialized in the corno da caccia — the hunting horn — and could achieve in the very high register an almost vocal sound that Bach used in cantatas and Passions to extraordinary effect.

The Baroque bassoon — the dulcian in its earlier versions — had a darker, more homogeneous sound than the modern instrument, without the tendency to squeak in the upper register that sometimes characterizes the contemporary one. It was the bass pillar of wind bands and of the continuo in outdoor music.

The historically informed movement: recovering what was lost

Understanding Baroque instruments in their specificity is not an exercise in musical archaeology: it is the difference between reading a poem in translation and reading it in the original language. The translation may be excellent, but something of the timbre, the texture, and the specific musicality of the original words is inevitably lost.

When Gustav Leonhardt played the harpsichord in the 1960s, when Nikolaus Harnoncourt conducted his Concentus Musicus Wien on period instruments, when Frans Brüggen blew an eighteenth-century wooden flute, they were not doing archaeology: they were hearing the music with new ears. Discovering that Bach had written for an instrument that produced certain colors a modern piano cannot reproduce. That Vivaldi had conceived a sonority of gut strings that is not the sonority of modern strings. That the organ Buxtehude played in Lübeck was a living organism with its own personality that recordings on modern instruments did not capture.

Today both worlds coexist: historically informed performance and performance on modern instruments. And perhaps that coexistence is the healthiest outcome: there is no single correct way to hear Bach, but there are more informed ways and less informed ways. The instruments are the first step toward that information. What happens when music you have loved for years suddenly sounds in its original sonority and you feel it was, at one and the same time, the same and something else entirely? That experience of estranged recognition is one of the gifts the history of instruments can offer us. It is also a warning: music does not exist in scores — it exists in sound. Paper holds everything; sound does not. In the next post we will leave Europe for the first time in the Baroque era, to discover what happened when European instruments, forms, and musical practices reached the Americas, Africa, and Asia through the Jesuit missions and colonial trade — and what was born from that encounter.

The harpsichord is not an out-of-tune piano. It is a different instrument, with a different logic, a different expression, and a different beauty.

Listening suggestions

• Partita for harpsichord No. 1 in B-flat major, BWV 825 — Bach, in Gustav Leonhardt's recording: listen to it first on piano, then on harpsichord, and notice the difference in character
• Toccata for organ in F major, BWV 540 — Bach, on the Schnitger organ at the Martinikerk in Groningen: to hear the Baroque organ in its real acoustic context
• The Four Seasons — Vivaldi, in the recording by Il Giardino Armonico with Giovanni Antonini: gut strings, Baroque bows, and a rhythmic energy that recordings with modern orchestras rarely achieve
• Lachrimae — John Dowland, in a version for lute and viol consort: to hear the lute at its finest, in a context that is pure late Renaissance and anticipates the Baroque