Performance note from Hyperion CD booklet.
It has been more than two centuries since Mozart composed the music performed on this recording and during that time the horn, an instrument he loved and knew well, has evolved substantially. During the nineteenth century it grew valves and extra loops of tubing; it ceased to be a ‘hand horn’, or a ‘natural horn’, and emerged from experimentation and confusion as a fully chromatic instrument. The response by later composers to these changes was to write music that increasingly exploited the horn’s new ability to play not only any note with a full and sonorous resonance but also any note with a closed, ‘stopped’ sound. The evolution of the horn continued with a widening of its bore and an increase in dynamic range to suit the music of Wagner, Mahler, Richard Strauss and many others. Today, the horn’s modern character can best be experienced by hearing the way it is used in orchestral film scores to depict the archetypal ‘hero’, conveying such attributes as strength, courage, seriousness, stability and control. Before the horn ‘grew up’ its character was altogether rougher, wilder, more unpredictable, playful and idiosyncratic—perhaps more Robin Hood than James Bond.
It is in getting from one note to the next that the mechanics of the instrument and the technique of its playing are so different between the old and the new. This difference is much larger than with instruments that did not have such a marked metamorphosis in their historical development—that is, the addition of valves. Stringed instruments are still essentially the same as they were in Mozart’s day. Woodwind instruments have gained more projection and refinement but are essentially still pipes with vent holes. The piano, Mozart’s favourite instrument of all, has been developed and refined in countless ways but still involves the mechanism of fingers pushing keys to make hammers hit strings. Changes to other instruments have been in timbre and power. But from hand horn to modern horn the change has been more profound.
Without doubt Mozart would have loved the modern valved horn with its fully chromatic ability, and if his friend, the horn player Joseph Leutgeb, had possessed one then Mozart would have written entirely different music for him. Mozart’s horn concertos sound wonderful played on the modern horn, of course, but inevitably, along with the broader, warmer voice and gains in both smoothness and uniformity of timbre across the entire range, some of the colour and drama that Mozart would have expected is lost.
To play the hand horn is to wrestle with nature. While the modern valved horn will cruise comfortably through most things in the classical repertoire the hand horn simply doesn’t want to cooperate with at least half of the notes Mozart threw at it. Its natural array of pitches, the harmonic series, does not align with any kind of equal or non-equal temperament or any sort of scale, whether major, minor, chromatic or whatever. Melodies have to be physically wrenched into shape from both ends of the instrument; at the narrow end by strenuous techniques of breath and lip, and at the other end, within the throat of the bell flare, by rapid manipulations of the right hand for correcting and continuously adjusting the intonation of every one of the instrument’s naturally occurring tones. This right-hand technique unavoidably alters both loudness and timbre from one note to the next, often quite drastically, and it is this phenomenon that accounts for most of the differences in musical effect between the classical hand horn and the modern horn.
After the development of valves, the ancestral hand horn did not disappear. It remained, as it was in the eighteenth century, arguably one of the most perfect of all instruments in its simple emulation of natural forms such as cow horns or large sea shells. It is nothing more than a long, narrow, conical brass tube with a small hole in which to blow at one end and a bigger hole where the sound emerges at the other end. It starts at a diameter of about 8mm (about one third of an inch) and continuously widens along its length until it ends with a dramatic widening into a flared bell of about one foot in diameter. For convenience and comfort hand horns are coiled into loops and are traditionally played with the bell held to the right, pointing backwards and to the side at about waist level. These days we call it the ‘natural horn’ or ‘hand horn’, to differentiate it from its modern descendant, the ‘French horn’—a poorly named grandchild since there is nothing particularly French about it.
Despite the visual complexity of its convoluted plumbing, the modern valved horn can be understood simply as a combination of twelve differently lengthed hand horns into one super-instrument (perhaps ‘Dodecahorn’ would be a better name for it). The modern horn player switches instantly from one length to another by means of finger-operated valves. It is actually possible to play an entire Mozart horn concerto on just one of the twelve component instruments of a modern horn using hand-horn techniques rather than by employing the valve mechanisms. However, this is not generally done because the merging of twelve instruments invariably causes a compromise in quality to each one. Also, it has to be said that there is something very pure and satisfying about playing great works by Mozart on such a wonderfully simple instrument.
The complexity of the modern horn conceals any resemblance to its ancient, naturally occuring ancestors whereas the simplicity of the hand horn makes such a visual connection obvious. Although a spirally curved cone is a complex shape and difficult to make it is an easy structure to understand, being essentially a tube which gradually widens. Molluscs and cows grow their curved cones naturally and unconsciously, but humans have needed many centuries to learn first how to copy and then to extend the concept, fabricating delicate coils of accurately tapered metal tubing far greater in length than animal horns. Historically, advances in musical instrument metal-working technology have been driven by this need to make horns longer than those provided by nature. The extra length is desired because short, naturally occurring horns allow only the lowest note of the harmonic series to be played (the so-called ‘fundamental’), all the other ones being too high to play comfortably. Many ancient cultures understood this. Trumpets of bronze, silver and gold were discovered in Tutenkhamun’s tomb and the Romans used brass and copper horns and trumpets for military purposes. In the bronze age the Celts had their ‘carnyx’, the Scandinavians had their ‘lur’ and in Ireland they made fabulous bronze horns shaped like those of the now extinct giant bison.
During Mozart’s time hand horns were available in a range of fifteen different lengths, from the shortest in the key of C (alto) at eight feet four inches (2.54 meters), to the longest in B flat (basso) at an impressive nineteen feet (5.79 meters). The length, or key, favoured by Mozart was somewhere in the middle, the E flat horn, at about fourteen feet long. The instrument used in this recording is a modern copy of an 1830 Ignaz Lorenz of Linz, made in Bavaria by Engelbert Schmid.
The standard classical pitch used these days for (so-called) ‘historically informed performance’ is somewhat lower than modern pitch, where A is set to vibrate at 440 cycles per second. Orchestras such as The Hanover Band usually tune A to 430Hz for music of the classical period, and this is the pitch used in this recording for the four concertos. For the quintet recording, due to the absence of woodwind instruments which are specifically built to be played at 430 and have far less flexibility to adjust pitch than stringed or brass instruments, it was possible to take the pitch down approximately one third of a semitone further, to 421 cycles per second. This is exactly the frequency of the tuning fork that belonged to Mozart.
At several points during the horn concertos Mozart indicates that the soloist should play a short unaccompanied passage, a ‘cadenza’, of his or her own invention. This is a difficult task for the modern horn player: adding anything of value to historical works of great musical genius is challenging, to say the least. Because of the instrument’s natural simplicity the task of cadenza-writing for the hand horn in Mozart is somewhat easier than it is for the modern instrument. When playing the fully chromatic modern horn it is hard to be constantly mindful of avoiding anything which would have been technically unfeasible during the classical period. The use of valves, however carefully and tastefully applied, creates an effect impossible for the hand horn, so by playing on the type of horn Mozart knew one avoids such anachronisms. Removing that complication allows one to focus more on questions of musical material and style. In preparing the cadenzas for these performances I investigated those that Mozart took the trouble to write down (although he never composed any for horn). Searching through his published keyboard cadenzas I found that here, more than anywhere else, he explored chromatic harmonies with the greatest intensity and passion. In his later works the urge to delve deeper into chromaticism becomes increasingly obvious and this shows clearly in his horn-writing, where he pushes hard against the instrument’s inherent limitations.
In attempting to escape from the instrument’s constant pull towards E flat major, I have tried to stretch its scant chromatic capabilities as far as practically possible (in particular by using diminished harmonies) while attempting to keep within the spirit of Mozart’s horn-writing and what is known of his cadenza style. I can only apologize to the ghost of Mozart for any musical crimes I may have committed. In my defence (and in that of horn players everywhere), if a cadenza is indicated by Mozart we are obliged to do at least something.
Pip Eastop © 2015