LESSON XIV

THIRD SPECIES

[Ill.u.s.tration: Fig. 107.]

The suggestions for third species in two-part counterpoint, as well as those for writing the second species in three-part counterpoint, apply when writing third species in three-part counterpoint.

The cadences at Fig. 108 are good, and will suggest others.

[Ill.u.s.tration: Fig. 108.]

EXERCISES

To cantus firmus _a_ write third species in one part. Write three settings as previously directed.

To cantus firmus _b_ write second species in two parts, as previously directed.

Write one eight-measure phrase, using second species in all parts.

CANTI FIRMI

[Ill.u.s.tration: Fig. 109.]

LESSON XV

THIRD SPECIES IN TWO OR MORE PARTS

[Ill.u.s.tration: Fig. 110.]

Previous suggestions when two or more parts have other than first species, apply here.

In using the ninth of a chord it is well to keep it at least a seventh distant from the third, as well as a ninth above the root, except in the case of the dominant ninth in minor keys, where it may be separated by only an augmented second ([b]). [Fig. 111.]

[Ill.u.s.tration: Fig. 111.]

In writing the third species in all parts, notes appearing simultaneously should be harmonically related. Treat all tones foreign to the chord on the first quarter as dissonances.

The cadences in Fig. 112 are good.

[Ill.u.s.tration: Fig. 112.]

EXERCISES

To cantus firmus _a_ write third species in one part, as previously directed.

To cantus firmus _b_ write third species in two parts, as in Fig. 110_b_.

Write twice, changing the cantus firmus about.

Write one eight-measure phrase, mixing first and third species as in Fig.

110_a_.

CANTI FIRMI

[Ill.u.s.tration: Fig. 113.]

LESSON XVI

THIRD SPECIES (Continued)

EXERCISES

To the cantus firmus write third species in one part, as previously directed.

Write one eight-measure phrase, mixing first and third species; also one mixing first, second and third. [Fig. 114.]

Write one eight-measure phrase, using third species in all parts. [Fig.

110_c_.]

[Ill.u.s.tration: Fig. 114.]

CANTUS FIRMUS

[Ill.u.s.tration: Fig. 115.]

LESSON XVII

FOURTH SPECIES