THE FLIGHT OF THE EARLS
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The statement is sometimes made that the principles of our modern system of tonality and of modulation are derived from Folk-music. This is only partially true, for pure Folk-songs always developed under the influence of the old medieval modes, long before the establishment of our fixed major and minor scales. Furthermore, as these were single unaccompanied melodies, they showed slight connection with modulation or change of key in the modern sense of the term—which implies a system of harmonization in several voices. It is true that there was an instinctive and growing recognition of the importance of the three chief tonal centres: the Tonic or Keynote, the Dominant (a perfect fifth above) and the Subdominant (a perfect fifth below) and at times the relative minor. All these changes are illustrated in the melody just cited; e.g., in the fourth measure[25] there is an implication of E minor, in measures seven and eight there is a distinct modulation to D major, the Dominant, and in the ninth measure to C major, the Subdominant. This acceptance of other tonal centres—distant a fifth from the main key-note—doubtless arose from their simplicity and naturalness, and was later sanctioned by acoustical law; the interval of a perfect fifth having one of the simplest ratios (2-3), and being familiar to people as the first overtone (after the octave) struck off by any sounding body—such as a bell or an organ pipe. The Venetian composers, notably Willaert, had also quite fully developed this principle of Tonic, Dominant and Subdominant harmony in order to give homogeneity to their antiphonal choruses. Even to-day these tonal centres are still used; for they are elemental, like the primitive colors of the spectroscope. But modulation, in the modern sense of a free shifting of the centre of gravity to any one of the twelve semitones of our chromatic scale, was not developed and accepted until after the acoustical reforms of Rameau, and the system of tuning keyed instruments embodied in that work called the Well-tempered Clavichord of Sebastian Bach. Both these men published their discoveries about the year 1720.
As we have just used the term modal, and since many Folk-songs in the old modes sound peculiar or even wrong (hence the preposterous emendations of modern editors!) because our ears can listen only in terms of the fixed major and minor scales, a few words of explanation concerning the nature of the medieval modes should here be given. Their essential peculiarity is the freer relationship of tones and semitones than is found in the definite pattern of our modern scales. It is of great importance that the music-lover should train himself to think naturally in these modes; for there has been a significant return to their freedom and variety on the part of such modern composers as Brahms, Tchaikowsky, Dvořák, d'Indy, Debussy and others, and some of their most individual effects are gained through the introduction of modal types of expression. The following modes are those most commonly employed in the formation of Folk-songs.
DORIAN
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PHRYGIAN
