Listen to This. Alex Ross

his own admission, could be “as proud as a peacock,” and the Archbishop of Salzburg, whose service he quit in 1781, was not the only person who considered him “dreadfully conceited.” Conceit edges easily into paranoia, and Mozart was not immune. “I think that something is going on behind the scenes, and that doubtless here too I have enemies,” he wrote from Paris, in 1778. “Where, indeed, have I not had them?” As he traces conspiracies, mocks the French, and extols the Germans, he sounds curiously like Richard Wagner.

      Later, in Vienna, Mozart clung to the idea that Antonio Salieri, the Imperial Kapellmeister, was plotting against him. Whether or not such intrigues existed—John Rice’s biography of the supposedly dastardly Salieri portrays him as a likable character, and an intermittently imaginative composer—Mozart himself was not above politicking: when he applied for the job of second Kapellmeister, he pointedly observed that “Salieri, that very gifted Kapellmeister, has never devoted himself to church music.”

      Playfulness was Mozart’s saving grace. His counterpart in modern times is perhaps George Gershwin, who was charming and self-infatuated in equal measure. Latter-day attempts to find a dark, despondent layer in Mozart’s psychology have been unconvincing. In his correspondence, he once or twice displays depressive symptoms—alluding to his “black thoughts,” describing sensations of coldness and emptiness—but context is all-important: in the first instance, he is begging for money, and in the second he is telling his wife, the demanding Constanze, how much he misses her. Nor should too much be made of a letter in which Mozart tells his dying father that death is the “true goal of our existence,” the “best and truest friend of mankind.” These sentiments were commonplace in a world where lives ended early and without warning. Of the seven children born to Leopold and Maria Anna Mozart, Wolfgang was one of two who survived infancy; only two of his own six children lived to adulthood. Against this backdrop, Mozart seems, if anything, indefatigably optimistic.

      Leopold Mozart said of his son, “Two opposing elements rule his nature, I mean, there is either too much or too little, never the golden mean.” Often, an artist sets forth in his work what he cannot achieve in life, and Mozart’s music is the empire of the golden mean. Nicholas Kenyon, in The Pegasus Pocket Guide to Mozart, writes, “Other great composers have expressed the extremes of life: affirmation, despair, sensual pleasure, bleak emptiness, but only in Mozart can all these emotions coexist within the space of a short phrase.” Mozart inhabits a middle world where beauty surges in and ebbs away, where everything is contingent and nothing pure, where, as Henry James’s Madame Merle says, an envelope of circumstances encloses every human life. It is a place where genres meld; where concertos become operatic and arias symphonic; where comedy and tragedy, and the sensual and the sacred, are one.

      You can find the golden mean running through the Andante of the Sinfonia Concertante for Violin and Viola, from 1779–80. A beguiling four-bar melody appears twice, in E-flat major in the middle and in C minor at the end. The first time, the major mode is briefly shadowed by a turn into the relative minor. The second time, minor is flecked by major, creating the effect of a light in the night. The two passages are more or less the same, but the space between them could contain a novel.

      The musicologist Scott Burnham has observed that Mozart offers the “sound of the loss of innocence, the ever renewable loss of innocence.” There is no more potent subject for an artist, and it explains why Mozart remains so vivid a presence. As ever, the slow movement of the Piano Concerto No. 23 sends us into a pensive trance, the finale of the “Jupiter” Symphony wakes us up into a uniquely Mozartian kind of intelligent happiness, and the catastrophic climax of Don Giovanni stirs our primal fear of being weighed in the balance and found wanting. The loss of innocence was Mozart’s, too. Like the rest of us, he had to live outside the complex paradise that he created in sound.

      Thousands of books have been written about Mozart, and they present a bewildering variety of images. For a long time, well into the twentieth century, many people pictured Mozart as the “eternal child”—an antic boy-man who happened to write sublime music. This was a theme of Alfred Einstein’s 1945 biography, long considered the standard work. Pushkin, in his play Mozart and Salieri, came up with an influential variant: Mozart as “idle hooligan.” This led to the eternal adolescent of the play and movie Amadeus—a potty-mouthed punk who happened to write sublime music. Other commentators have made Mozart out to be a Romantic in the making or a modernist before the fact—an aloof, tortured character, an agent of sexual subversion, or a clandestine social revolutionary.

      Present-day scholars are picking away at the myths and fantasies that have encrusted the composer. They describe him not as a naïve prodigy or a suffering outcast but as a hardworking, ambitious, successful musician—“Mozart as a Working Stiff,” to borrow the title of an essay by Neal Zaslaw. One notable upshot has been the rehabilitation of Leopold Mozart, who long loomed over his son’s life story as an oppressive, even abusive, figure. Maynard Solomon, in his 1995 biography, presented damning evidence against Leopold, writing of the father’s “erotically tinged drive to dominate” his son. Leopold is said to have exploited Wolfgang in his early years, squirreling away profits from their European tours. When the gifted child became a problematic teen, Leopold exhibited an unhealthy possessiveness, opposing his son’s marriage plans and berating him for what he considered spendthrift behavior. His letters contain passages of world-class manipulation. “Your whole intent is to ruin me so you can build your castles in the air,” Leopold wrote in 1778, not long after his wife died while accompanying her son to Paris. “I hope that, after your mother had to die in Paris already, you will not also burden your conscience by expediting the death of your father.”

      Leopold was a bit of a monster, but the job of raising the Miracle of Salzburg would have sapped anyone’s patience. Ruth Halliwell made the case for Leopold in her illuminating 1998 book, The Mozart Family. The father didn’t so much exploit the son as make him possible. Those long European tours gave Mozart an incomparable education; he went to London, Paris, Vienna, Milan, and Munich, met the monarchs and princes of the day, and talked to most of the leading composers. Knowing that his son’s musical gifts far exceeded his own, Leopold offered advice on the practical aspects of art and life, in which he was rather better versed. Who can deny the truth of Leopold’s maxim “Where money is plentiful, everything is dear, and where living is cheap, money will be scarce”? Or: “The best way to make people feel ashamed of themselves is to be extremely friendly and polite to those who are your enemies”? Mozart’s path would have been easier if he had absorbed a few of the bland but useful adages that his father passed along.

      The letters between father and son become much livelier when music is the subject. On musical matters, the Mozarts are essentially of one mind; Leopold never seems to be reining in his son’s imagination. In late 1780 and early 1781, Mozart was in Munich, preparing his first major opera, Idomeneo, while Leopold was in Salzburg, supervising the librettist. The young composer was unleashing every expressive device available to him: as David Cairns writes, in his 2006 book Mozart and His Operas, Idomeneo touches on “love, joy, physical and spiritual contentment, stoicism, heroic resolution; the ecstasy of self-sacrifice, the horrors of dementia, the agonizing dilemma of a ruler trapped in the consequences of his actions; mass hysteria, panic in the face of an unknown scourge, turning to awe before the yet more terrible fact; the strange peace that can follow intense grief; the infinite tenderness of a father’s last farewell to his son.” Leopold was mostly a bystander to Mozart’s feat, but he did make one crucial contribution: for a pivotal scene in Act III, when the voice of Neptune’s oracle rises from the depths, he requested “moving, terrifying, and altogether unusual” music, and went on to suggest a series of sudden crescendos and decrescendos in the brass and winds, bracketing the vocal phrases. Exactly this effect appears in the finished score.

      Perhaps Leopold’s greatest gift to his son was the instruction to compose with both musical insiders and the general public in mind. In a letter from 1782, Mozart takes that favorite phrase of his father’s—“the golden mean”—and weaves around it a pragmatic philosophy that is just as relevant now as it was in the eighteenth century:

      These concertos [Nos. 11, 12, and 13] are a happy medium between what is too easy and too difficult; they are very brilliant, pleasing to the ear,