p153scoreAuthentic Modes.Plagal Modes.
Authentic Modes.Plagal Modes.
The modes were in as far as possible strictly adhered to, but the occurrence of certain intervals difficult to sing and not wholly pleasant to the ear (notably the augmented fourth, or tritone,[64]from F to B), led to modifications or, as we should say, chromatic alterations. B-flat, for instance, was substituted for B whenever the interval from F to B occurred; and later, in the development of part singing, many other alterations were found necessary. Marks indicating such alterations were seldom written in the score, and singers were specially trained to alter intervals at sight, according to the elaborate rules of the practice calledmusica ficta, or ‘false music.’
We have already adverted to the gradual decline in the use of the Greek language at Rome and the incidental passing from the minds and the memories of men of the alphabetical system of notation which had been inherited from the Greeks. It is not quite clear, however, how the Oriental church, which used Greek until a comparatively late period and even introduced that language into the liturgy of the Latin church, could have absolutely ignored the Greek system of notation. Yet such appears to be the case. As far as we can discover, the early chants of the church, both in the East and in the West, were handed downviva voce, and not until about the eighth century do we find traces of any attempt to devise a system of graphic aids to musical memory. This system, as we first find it, was of a most elementary sort and consisted merely of a few strokes and dashes placed above the text of the song and serving apparently no other purpose than to indicate in a general way the rising and falling inflections of themelody. These signs are known asneumes, and from them gradually developed our modern system of notation. The origin of theneumesis quite obscure. It would appear that at first they consisted merely of the acute and grave accents borrowed from the Byzantine grammarians and designed to indicate the occurrence of a rising and falling inflection respectively. To them were gradually added dashes, strokes, curves, and hooks in various combinations which in time became a fairly complete and precise system of musical writing. Their evolution into the square and diamond-shaped Gothic notation of the middle ages can be followed with sufficient clearness.
p155score1Specimen of Notation in Neumes, Tenth and Eleventh Century.
Specimen of Notation in Neumes, Tenth and Eleventh Century.
These signs, though representing definite turns and embellishments in the melody, gave no exact indication of pitch. The first sign of anything approaching a staff occurs in the tenth century, when one or two lines were drawn across the page to mark the place of certain tones or pitches. The first line was used for the tone F and the second for the tone C. Other lines were later added for the other tones, and each line was marked with the letter of the tone to which it was assigned. Though all the letters of the scale were used in this fashion, F, C, and G were the ones most commonly employed and from the Gothic characters for these were developed our modern clef signs, as may be seen from the following illustration:
ilo2p153Genesis of Clefs from Gothic Letters.
Genesis of Clefs from Gothic Letters.
A system of letter notation seems to have grown up contemporaneously with the neumatic system. Its invention has been ascribed to Gregory the Great and to Boethius, without much authority in either case. The first instances of its practical use are found in the writings of Notker Balbulus and Hucbald. Originally fifteen letters were used to designate the tones of two octaves; this number was afterward reduced to seven, repeated in successive octaves. The letters ran from A to G, but none of them had a definite tone meaning, as they have with us. A was merely the tone taken as a starting point and the series was always counted upward from it. In the system as it was finally completed the lowest G was added and calledgammato distinguish it from the G in the regular series. It is of interest to note here that the introduction of B flat necessitated the use of two differently shaped B’s. The Bdurumwas angularp156s1and the Bmollewas roundedp156s2. From the former was derived our natural sign (♮) and from the latter our flat sign (♭). Our sharp is merely a variation of the natural. The system of letter notation was originally devised chiefly for instruments, particularly the organ, though its use gradually became universal. It belongs, however, more properly to a period later than the one we have been discussing.
One other item may justly find a place in this chapter, namely, the early history of the organ. The instrument has virtually since the beginning of our era been associated with the church, and was already a factor in the service during the plain-song period. We shall presently see how one of the earliest forms of polyphony—of music that was not merely plain chant—received its name from the instrument. The organ is of ancient origin; according to Riemann, its ancestors are the bagpipe and the Pan’s pipe. Already in the second century B. C. there existed a true organ, in which air pressure was generated by pumps (bellows) and compressed by means of water pressure and the manipulation of a keyboard. The invention of this so-called water-organ (organum hydraulicum, hydraulic organ) was ascribed to Ktesibios (170 B. C.) by his pupil Heron of Alexandria, whose writings have come down to us. Water was, it seems, not a necessary accessory to this instrument and organs were soon after constructed without the hydraulic principle, in Greece and Italy.