So Salome came to Graz, an elegant city of 150,000 people, capital of the agricultural province of Styria. The Stadt-Theater staged the opera at the suggestion of the critic Ernst Decsey, an associate of Mahler's, who assured the management that it would create a succès de scandale.

"The city was in a state of great excitement," Decsey wrote in his autobiography, Music Was His Life. "Parties formed and split. Pub philosophers buzzed about what was going on ... Visitors from the provinces, critics, press people, reporters, and foreigners from Vienna .. Three more-than-sold-out houses. Porters groaned, and hoteliers reached for the keys to their safes." The critic fueled the anticipation with a high-flown preview article acclaiming Strauss's "tone-color world," his "polyrhythms and polyphony," his "breakup of the narrow old tonality," his "fetish ideal of an Omni-Tonality."

As dusk fell, Mahler and Strauss finally appeared at the opera house, having rushed back to town in their chauffeur-driven car. The crowd milling around in the lobby had an air of nervous electricity. The orchestra played a fanfare when Strauss walked up to the podium, and the audience applauded stormily. Then silence descended, the clarinet played a softly slithering scale, and the curtain went up.

In the Gospel of Saint Matthew, the princess of Judaea dances for her stepfather, Herod, and demands the head of John the Baptist as reward. She had surfaced several times in operatic history, usually with her more scandalous features suppressed. Strauss's brazenly modern retelling takes off from Oscar Wilde's 1891 play Salomé, in which the princess shamelessly eroticizes the body of John the Baptist and indulges in a touch of necrophilia at the end. When Strauss read Hedwig Lachmann's German translation of Wilde-in which the accent is dropped from Salomé's name-he decided to set it to music word for word, instead of employing a verse adaptation. Next to the first line, "How beautiful is the princess Salome tonight," he made a note to use the key of C-sharp minor. But this would turn out to be a different sort of C-sharp minor from Bach's or Beethoven's.

Strauss had a flair for beginnings. In 1896 he created what may be, after the first notes of Beethoven's Fifth, the most famous opening flourish in music: the "mountain sunrise" from Thus Spake Zarathustra, deployed to great effect in Stanley Kubrick's film 2001: A Space Odyssey. The passage draws its cosmic power from the natural laws of sound. If you pluck a string tuned to a low C, then pluck it again while pinching it in half, the tone rises to the next C above. This is the interval of the octave. Further subdivisions yield intervals of the fifth (C to G), the fourth (G to the next higher C), and the major third (C to E). These are the lower steps of the natural harmonic series, or overtone series, which shimmers like a rainbow from any vibrating string. The same intervals appear at the outset of Zarathustra, and they accumulate into a gleaming C-major chord.

Salome, written nine years after Zarathustra, begins very differently, in a state of volatility and flux. The first notes on the clarinet are simply a rising scale, but it is split down the middle: the first half belongs to C-sharp major, the second half to G major. This is an unsettling opening, for several reasons. First, the notes C-sharp and G are separated by the interval known as the tritone, one step narrower than the perfect fifth. (Leonard Bernstein's "Maria" opens with a tritone resolving to a fifth.) This interval has long caused uneasy vibrations in human ears; medieval scholars called it diabolus in musica, the musical devil.

In the Salome scale, not just two notes but two key-areas, two opposing harmonic spheres, are juxtaposed. From the start, we are plunged into an environment where bodies and ideas circulate freely, where opposites meet. There's a hint of the glitter and swirl of city life: the debonairly gliding clarinet looks forward to the jazzy character who kicks off Gershwin's Rhapsody in Blue. The scale might also suggest a meeting of irreconcilable belief systems; after all, Salome takes place at the intersection of Roman, Jewish, and Christian societies. Most acutely, this little run of notes takes us inside the mind of one who is exhibiting all the contradictions of her world.