Let us compare the orchestral pitch of the eighteenth with that of the nineteenth century. As the peoples of Europe became more passionate and agitated in public and in private life, and as our whole intellectual life rose to a higher level, our orchestral tone was keyed up higher. In 1739 Euler reckoned the vibrations of the great eight-foot C to be one hundred and eighteen to the second. In 1776, Marpurg, for the same tone, gives one hundred and twenty-five vibrations. Chladni, in the year 1802, calculated its vibrations as a hundred and twenty-eight, twenty years later as a hundred and thirty-six to a hundred and thirty-eight to the second. And since then we have, no doubt, gone noticeably higher!
We find, then, that the tone has risen most emphatically since the appearance of the Romanticists; in the days of the Classical School it remained the same for the greatest length of time. The latter was the period of the most moderate artistic expression. At present, on the contrary, we thirst for shriller and shriller tones, higher and higher singing. Even though every violin treble-string snaps and every singer's throat becomes exhausted before its time, we go on forcing the tone higher from decade to decade.
The entirely reversed relation of church-pitch to concert-pitch, which has taken place in the course of time, appears noteworthy in this connection. Even in the eighteenth century, church-pitch was much higher than concert-pitch, and surely for a reason far deeper than the mere wish to save tin on the organ pipes. For the old masters used church music for the portrayal of strong emotions, and on this account they needed the shriller pitch. Bach is much more shrilly and characteristically dramatic in his church cantatas than contemporary masters of Italian opera. Chamber and theatrical music, for which the lower, milder, more agreeable orchestral tone was chosen, was played, for the most part, only with the semblance of emotion. When Gluck and Mozart transported tragedy from the church to the stage and concert hall, concert-pitch naturally had to assume the rôle of church-pitch, and thus the former has in fact gradually become higher than the latter.
There is still another fact connected with this. Händel's operas seem to us concert-like; the arias of Bach's church cantatas often appear operatic. Many numbers of these cantatas would disturb us today in church; on the other hand we consider them exquisite religious parlor music—which they were far from being in Bach's day. We are no longer such a vehemently excitable generation religiously as to be able to endure Bach's music to its full extent in church; on the other hand, as individuals, in the family, in society we are infinitely more vehemently excitable and much higher tuned spiritually as well than were those of the eighteenth century; we want Bach in the concert hall and in the parlor. The pious and yet forcible leader of St. Thomas' Choir has been made a parlor musician by us and for us—but for his own generation he was not one.
In the last hundred years the compass of pitch of almost all instruments has been considerably enlarged in the treble. The high registers in which every ordinary violinist must be able to play nowadays would in those days have seemed too break-neck for the foremost virtuosos. Men themselves were not tuned high enough to take pleasure in such poignant chirping. The flute of the seventeenth century was a fourth lower than that of the eighteenth. In the flute and the piccolo of the nineteenth century we have again risen a third, yes, an entire octave above the eighteenth century! Our great-grandfathers called the bass flute flauto d'amore, the alto oboe, oboe d'amore, a bass viol, viola d'amore, because their ear found preferably in the deep middle tones the character of the tender, the sweet, and the languishing. Now we can scarcely play on the violin or wind instrument a love melody which does not rise two or three octaves above the normal.
The standard Italian song-composers of the first half of the last century were especially fond of using the middle register for tones expressive of peculiarly dramatic pathos, as well as for powerful final passages of arias. Our differently tuned ear demands that these tones of passion shall, as a rule, be as high as possible. The alto voice as a solo voice has almost entirely disappeared from the operas in which it formerly played so conspicuous a part. The elevated tone of our whole inner man has deprived us of any ear for the alto.
In any case we have here reached an extreme which is contrary to the very construction of the human vocal organs. Scarcely is moderate and natural compass of tone still permitted, even in a song. In every age the song-composer had been allowed to construct his melodies out of the fewest possible tones. While the elder Bach in his arias often chases the human voice in the most ruthless manner from one extreme to the other, his sons and pupils in their little German songs confine themselves to the most modest compass. Most of the later composers proceeded in the same way up to the time of the Romanticists; then the bonds were snapped, even in this respect. Schubert, on the one hand, could compose the most moderate songs, on the other, the most immoderate. It often seems (and this is also the case with Beethoven) that his fantasy rebelled against the fact that a curb was placed upon it by the natural limitation of the human voice.
This natural limitation, however, is once for all not to be done away with, and it is ignored only at the expense of feasibility. Some later Romanticists, therefore, such as Spohr and Mendelssohn, came back immediately to the comfortable middle register as the real vocal register of song. The thirst for shrill sounds had made men entirely forget that a song must be easy to sing just because it must always be sung suggestively and never be delivered with full dramatic execution. Do not our singers, who since Schubert's time are so fond of making a song a dramatic scene, feel how ridiculous it would be if a reader should declaim a song at the top of his voice like the dialogue of a drama?
In the invaluable privilege of writing for a moderate compass, a song-composer, almost alone of all composers, is provided with a means of reacting gradually upon instrumental music and of tuning anew the ear of our generation, so that it shall no longer find satisfaction in the shrill tones of extreme voice registers and the euphony of strong, easily and comfortably attained middle tones shall again be universally perceived. At the present moment our instrumental art has, in this particular, fallen under the tyranny of piano manufacturers and makers of wind instruments. When the keyboard of the grand piano has been made longer by a few keys, the composers think they are remaining "behind the times" if they do not immediately introduce these new high treble tones into their next work, and when the wind instruments have been enriched by several new valves and regulators the scores immediately grow in proportion to these keys and pistons. But does art feel no shame at having thus fallen under the dominion of trade!
The ear of the eighteenth century preferred human voices whose timbre approached closest to the violin, the oboe or the 'cello, and considered that such were peculiarly fitted for lyric and dramatic expression. The eunuch sings as if he had an oboe in his throat; it is much too harsh and lacking in brilliancy for our ear, which values incomparably higher the more brilliant, clearer timbre, corresponding to the tone of the flute, clarinet, or horn. The favorite timbre of the eighteenth century compares with that of the nineteenth as dull oxidized gold does with that brightly polished. The period of the Romanticists marks here too the turning-point of taste; Beethoven completed the emancipation of the above-mentioned wind instruments in the symphony. The modern treatment of the piano with the introduction of the perfect chord accelerated its victory at the same time. It worked favorably for the external brilliancy of tone of this instrument, while gradually closing the ears of the dilettante and the musician to the charms of a simple but characteristic management of the voice in accordance with the rules of counterpoint. Thus the layman nowadays has seldom an ear for the subtleties of the string quartet, whereas, on the other hand, our great-grandfathers would indubitably have run away from the sound of our brass bands and military music. The earlier symphonies, since they were essentially intended to bring out the effects of the stringed instruments, now seem like darkened pictures. Yet the symphonies have certainly remained unchanged; only our ear has grown dull so far as comprehension of the tone-color of the string quartet is concerned. The same full orchestra, which in those works sounded so overpoweringly imposing seventy years ago, now sounds to us simply powerful. In such symphonies, in order to sharpen our ears, which have become dulled in this respect, we have arrived at the strange necessity of doubling the parts of the stringed instruments in a simple wind instrument ensemble, so as to attain the same effect which old masters attained with a simple distribution of the string parts.