Beethoven: 6th Sonata
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In this sentence it is evident that we cannot stop at the 8th measure and that our first definite conclusion is in measure 12. Let the student observe the varied melodic outline in the three phrases, and question himself as to the types of cadence and ending.
Minuetto of Beethoven’s First Sonata.[58]
In this beautifully constructed twelve-measure sentence we have the main motive of the entire movement set forth in measures 1 and 2; then a contrasting secondary motive in measures 3 and 4. The second four-measure phrase, i.e., measures 5, 6, 7 and 8, repeats the material exactly, but with a modulation into the relative major. In measures 9 and 10 we find the secondary motive appearing in the alto voice (which should be brought out in performance), and in measures 11 and 12 a free ending in the relative major. The closing measures, 13 and 14, give an echo-like effect, which will be explained when we come to extended sentences. Such a sentence is not to be considered as one of 14 measures, although the literal counting gives that number; for the first complete cadence occurs in the 12th measure at the end of the third four-measure phrase; the remaining measures being supplementary.[59]
The last type of simple, normal sentence is that of 16 measures, divided into 4 phrases of 4 measures each. A clear distinction must be drawn between two successive sentences of 8 measures and the long sweep of a genuine 16 measure sentence. In the latter case there is no complete and satisfactory stop until we reach the cadence in the 16th measure.
First Sentence of the First Movement of the Twelfth Sonata.
No difficulty will be found in following the cadences and endings of this sentence, the long-drawn out lines of which give an impression of repose and tranquillity. Two more excellent examples of 16 measure sentences may be found in the Adagio of the Fifth Sonata, and in the Scherzo of the Third; the latter movement is remarkable for the polyphonic treatment of the opening motive.
Although the three types of sentence just studied, i.e., of 8, 12 and 16 measures are the normal ones, and would include a majority of all sentences—especially in smaller works—in large compositions there would be an unendurable monotony and rigidity were there invariably to be cadential pauses at every 4th measure. We all know the deadening effect of poetry which has too great uniformity of metric pattern; and verses of "The boy stood on the burning-deck" type are considered thoroughly "sing-song." It is obvious that elasticity may be gained, without disturbing the normal balance, by expanding a sentence through the addition of extra measures, or contracting it by the logical omission of certain measures or by the overlapping of phrases.