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JS Bach and Frederick the Great
Father and son conflict... JS Bach and Frederick the Great
Father and son conflict... JS Bach and Frederick the Great

The art of feud

This article is more than 19 years old
Bach's final work was a tribute to Frederick the Great. Or so the story goes. If you read between the notes, says James Gaines, you will find a devastating attack on everything the king stood for

Musicologists have long been fascinated by Bach's Musical Offering, one of his last and greatest instrumental works. Its 16 movements are based on a theme given to Bach by Frederick the Great during a visit to the Prussian court in Potsdam. But critical to an understanding of the work, is what Bach buried in the score: a devastating attack on everything that Frederick stood for and on the aesthetic ideals of the Enlightenment.

Frederick was a musician and composer of some skill as well as an avid collector of talent. He had been badgering his chief keyboard player, Carl Philipp Emmanuel Bach, to lure his father to Potsdam for a visit for several years - until finally the "old Bach", as he was by then known, could no longer politely resist. Bach was then 62 years old, only three years from his death, and the long trip from Leipzig would be his last journey.

In many ways, the King and the composer faced each other as the embodiments of warring values. Bach was a devout Lutheran householder who had fathered 20 children with two wives; one had left him a widower, the second was waiting for him at home. Frederick, a bisexual misanthrope in a childless, political marriage, was a lapsed Calvinist who held all religions in contempt. Bach wrote and spoke German. Frederick, who like all German princes had been educated in French, boasted that he had "never read a German book".

Nowhere were they more different than in their attitudes toward music. Bach represented church music, especially the "learned counterpoint" of canon and fugue, a centuries-old craft that by now had developed such esoteric theories and procedures that some of its practitioners saw themselves as the custodians of a quasi-divine art.

Frederick and the generation of Bach's sons were having none of that. They denigrated counterpoint as the vestige of an outworn aesthetic, extolling instead the "natural and delightful" in music, by which they meant the easier pleasure of song, the harmonic ornamentation of a single line of melody.

For Bach this new, so-called "galant" style, with all its lovely figures and stylish grace, was full of emptiness. Bach's cosmos was one in which the planets themselves played the ultimate harmony, a tenet that had been unquestioned since the "sacred science" of Pythagoras; composing and performing music was for him and his musical ancestors a deeply spiritual enterprise.

For Frederick and his generation, the goal of music was simply to be "agreeable", an entertainment and a diversion. Frederick despised music that, as he put it, "smells of the church", and in the disenchanted world of the Enlightenment, cosmic notions like the "music of the spheres" were just more dark-age mumbo jumbo. In short, Bach was a father of the late Baroque, and Frederick was a son of the early Enlightenment, and few father-son conflicts have ever been more pointed.

What happened the evening they met is, thanks to contemporary reports, fairly clear. Frederick gave Bach a complex theme of 21 notes and asked him to use it as the basis of an extemporaneous three-part fugue. It was a fiendishly difficult subject for development in counterpoint - so difficult, in fact, that Arnold Schoenberg, the greatest practitioner of counterpoint in the 20th century, wrote an article in 1950 that set forth the theory that the "Royal Theme" could only have been devised by Bach's son CPE, the only musician present with enough understanding of counterpoint to trump his father's.

Whoever the composer of the subject may have been, though, Bach managed to foil him, improvising a fugue that incorporated Frederick's theme no fewer than 12 times in a 17-minute piece (the transcription of which became the first movement of the Musical Offering). Such a feat was, and is, almost unthinkable; certainly no one else in that night's audience could have managed it, and that audience was Frederick's entire chamber ensemble, which included some of the age's foremost composers and virtuosi.

Frederick's next request must have been breathtaking to such a group. Since Bach had done so well with the three-part fugue, the king wondered if Bach might improvise a six-part fugue on the theme. Even though he had never even written a six-part fugue for keyboard, Bach immediately demurred. A very proud man who had never had to turn aside such a challenge, he had every reason to leave the court fuming, but he would have his say.

A Lutheran cantor, Bach had spent his entire professional life writing music for the church, which meant, by the mandate of Luther himself, composing music not from aesthetic imperatives alone but to communicate theological material. To do this, Baroque composers had recourse to a large vocabulary of so-called "musical-rhetorical figures" - ascending passages that could be used to signify resurrection, or hope, or happiness; descending figures that could communicate grief, or sorrow, death; and any number of other forms and rhythms to indicate a huge range of meanings and feelings (what Baroque composers called "affections").

Along with the many rhetorical figures in the Musical Offering are other aspects that sit very oddly in a piece ostensibly written to glorify the Prussian king. To begin with, the dedication was in German, where a polite dedication would have been in French. It began: "To Your Majesty is hereby consecrated in deepest submission a Musical Offering ..."

Translators have often rendered the German verb weihen as "dedicated" because "consecrated" simply sounds wrong, but the meaning of weihen was clear: "to consecrate". Bach knew that Frederick had no patience for organised religion, especially Christianity, so why would he have made his dedication sound less appropriate for a piece of music than for a ritual slaughter?

Bach often used key changes to connote specific meanings, and in a section of the piece meant to "exalt" the "glory" of Frederick by using some of the galant devices he loved, Bach ranges so deep into the deep flat keys - even past the five-flats key of B-flat minor, which was Christ on the cross in the St Matthew Passion - that one wonders if he is working to let the King's glory shine forth or digging a deep, dark pit for it.

The trio sonata for flute and strings is the work's centrepiece, clearly meant for Frederick to play, but it is in the form of a sonata da chiesa (church sonata), and in Frederick's vast music library, there was not a single sonata da chiesa . Bach would have known that, far from appreciating counterpoint, Frederick specifically prohibited his court composer from using its learned style.

Yet in addition to the three-part improvisation and the six-part fugue Frederick had asked for, Bach italicised his own aesthetic preference with a flourish of canons, the most rigorous form of counterpoint. That took some doing since, as Schoenberg pointed out, the Royal Theme "did not admit a single canonic variation". Bach had to invent canons that could be placed around Frederick's theme, and this he did, royally. There has never been a volley of canons like it. More than that, he gave Frederick exactly 10 of them. In Bach's work the number 10 was always associated with the law of the Old Testament, particularly in connection with canon.

Between the fourth and fifth canons are two epigrams addressed to the king. The fourth canon is an augmentation canon in contrary motion, meaning that the second voice is an inversion of the first and in notes twice as long. The inscription reads: "As the notes increase, so may the fortunes of the king." How odd, then, that the effect of this canon is relentlessly melancholy.

The next canon is the musical equivalent of an optical illusion: play it six times, and it will be back where it started only an octave higher, but without seeming to have left its original key. This canon is inscribed: "As the notes ascend, so may the glory of the king." But the magic of this canon is precisely that it does not seem to rise at all. What does that say about the glory of the king?

All of these oddly inappropriate elements in Bach's Musical Offering - and there are many more - are of a piece, and they add up to a very clear statement from Bach: beware the appearance of good fortune, Frederick; stand in awe of a fate more fearful than any this world has to give; seek the glory beyond the glory of this fallen world; and know that there is a law higher than any king's by which you and every one of us will be judged. Of course that is what he said. He had been saying it all his life.

· To order James Gaines' Evening in the Palace of Reason at £15.19 (including 5% discount and free UK p&p) call the Guardian book service on 0870 836 0875 or go to theguardian.com/bookshop

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