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Page 8
[Illustration: Fig. 47.]
Oblique motion to the unison is bad. It is permitted if it continues in the
same direction through the unison. [Fig. 48.]
[Illustration: Fig. 48.]
The unison may be used on any but the first quarter of a measure.
Frequent repetition of a figure as in Fig. 49 is not good.
[Illustration: Fig. 49.]
The embellishment may be used either above or below, whether a semitone or
a whole tone; but when it is a whole tone below, it is most satisfactory as
the ninth of the implied chord. [Fig. 50.]
[Illustration: Fig. 50.]
In minor the sixth and seventh degrees of the scale are raised both
ascending and descending, when used in harmonies containing the
leading-tone as a chord-tone. They are unaltered both ascending and
descending in harmonies containing the sixth degree of the scale as a
chord-tone. In other harmonies they are raised in ascending only.
The sixth or seventh degrees may be chromatically altered with only one
note intervening. [Fig. 51.]
[Illustration: Fig. 51.]
Six notes may be written to one of the cantus firmus, as in Fig. 52.
[Illustration: Fig. 52.]
The cadences in Fig. 53 are good.
[Illustration: Fig. 53.]
EXERCISES
To cantus firmus _a_ write three counterpoints above and three below, in
the third species.
Write two eight-measure phrases, using second species continuously in both
parts. [Fig. 34.]
CANTUS FIRMUS
[Illustration: Fig. 54.]
LESSON V
THIRD SPECIES IN BOTH PARTS
[Illustration: Fig. 55.]
The suggestions given for writing second species in both parts apply here,
except that when both parts move degreewise, any interval may come on the
second and fourth quarters, preferably a consonance. The third quarter is
treated the same as the second half when writing the second species in both
parts.
The augmented fourth, and diminished fifth and seventh, may be approached
in similar motion. [Fig. 56.]
[Illustration: Fig. 56.]
The augmented fourth following the perfect fourth, as in Fig. 56_a_, is good.
The minor seventh, and the major and minor ninth of a chord, may be used
freely on any but the first quarter, but must be consonant with the other
part. [Fig. 57.]
[Illustration: Fig. 57.]
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