A Concerto for Equals and a Two-Chord Mystery: Bach’s Brandenburg Concerto No. 3
Of all the brilliant and unconventional works that J.S. Bach sent as his "glorious job application" to the Margrave of Brandenburg in 1721, the Third Concerto is perhaps the most ingenious in its conception and the most puzzling in its construction. The Brandenburg Concerto No. 3 in G major, BWV 1048, is a work of pure, unadulterated string euphoria, a dazzling display of rhythmic vitality that reimagines what a concerto can be. It dispenses with the traditional division of soloist and orchestra, instead presenting a vibrant
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A Concerto for Equals and a Two-Chord Mystery: Bach’s Brandenburg Concerto No. 3
Of all the brilliant and unconventional works that J.S. Bach sent as his "glorious job application" to the Margrave of Brandenburg in 1721, the Third Concerto is perhaps the most ingenious in its conception and the most puzzling in its construction. The Brandenburg Concerto No. 3 in G major, BWV 1048, is a work of pure, unadulterated string euphoria, a dazzling display of rhythmic vitality that reimagines what a concerto can be. It dispenses with the traditional division of soloist and orchestra, instead presenting a vibrant democracy of sound.
The first thing one notices about the score is its unique instrumentation. Bach calls for nine solo string parts—three violins, three violas, and three cellos—plus the basso continuo (harpsichord and a bass instrument). He treats these nine players not as a unified orchestra, but as three competing and cooperating string trios. The result is a stunningly rich and complex tapestry of sound, a musical kaleidoscope where melodic fragments are passed seamlessly from violin to viola to cello, creating constantly shifting textures and a sense of perpetual, joyful motion. There is no star soloist; every single player is a vital part of the intricate contrapuntal web.
The opening movement is one of the most joyous and rhythmically infectious creations in all of Baroque music. Built on a theme that seems to tumble over itself with energetic delight, the movement is a masterclass in musical conversation. The three choirs of strings echo, imitate, and embellish each other’s ideas, creating waves of sound that build and recede with breathtaking precision. It is the musical embodiment of pure, life-affirming energy.
But it is the second movement that has sparked centuries of debate and remains one of music's great unsolved puzzles. In the score, this "slow movement" consists of just two simple chords, marked Adagio. That’s it. A musical question mark hanging in the air. What on earth did Bach intend? This two-chord cadence is so brief and inconclusive that it feels less like a movement and more like a beautifully crafted semicolon.
Musicologists and performers have offered many theories, leading to a variety of performance practices. Some believe the chords are meant to be played simply as written, a moment of brief, quiet repose before the finale bursts forth. Others contend—and this is the most common approach today—that the chords are an open invitation for a soloist to improvise a virtuosic cadenza. This would typically be taken by the first violinist or the harpsichordist, who would bridge the two outer movements with a flight of brilliant fantasy. This latter interpretation turns the concerto’s central mystery into a moment of unique, unrepeatable creativity for the performers.
Whatever Bach’s original intention, the effect is to create a moment of dramatic suspense before the explosive release of the finale. Marked Allegro, the last movement is a brilliant and dizzying gigue in 12/8 time, a whirlwind of perpetual motion that sweeps the listener up in its unstoppable current. It is a thrilling conclusion to a concerto that is as intellectually fascinating as it is viscerally exciting, a true celebration of the collective joy of string playing.
