To cantus firmus _a_ write second species in one part and fifth in the other. [Fig. 128_a_.]

To cantus firmus _b_ write third species in one part and fifth in the other. [_b_.]

To cantus firmus _c_ write fourth species in one part and fifth in the other. [_c_.]

To cantus firmus _d_ write fifth species in two parts. [_d_.]

[Ill.u.s.tration: Fig. 128.]

CANTI FIRMI

[Ill.u.s.tration: Fig. 129.]

LESSON XXI

COMBINING THE VARIOUS SPECIES

EXERCISES

Write one eight-measure phrase each, of the following combinations: (1) 2nd, 3rd and 4th species (Fig. 130a); (2) 2nd, 3rd and fifth species (_b_) (3) 3rd, 5th and 5th species (_c_); (4) 2nd, 4th and 5th species (_d_); (5) 4th, 5th and 5th species (_e_).

[Ill.u.s.tration: Fig. 130.]

LESSON XXII

FIFTH SPECIES IN ALL PARTS

EXERCISES

Write five eight-measure phrases with fifth species in all parts, making use of imitation at the beginning as in Fig. 131. The imitation need only be relative and continue for three or four notes. It is also well, when a part uses a striking melodic figure, to have some other part imitate it immediately after.

[Ill.u.s.tration: Fig. 131.]

SIMPLE COUNTERPOINT IN FOUR PARTS

LESSON XXIII

[Ill.u.s.tration: Fig. 132.]

No new suggestions are needed, except as follows: All covered fifths and octaves permitted in harmony are allowed here. When the cantus firmus is in the lowest part and the choice of the last chord but one is V4/3 or vii_6, use the latter, as in Fig. 133.

[Ill.u.s.tration: Fig. 133.]

EXERCISES

To canti firmi _a_ and _b_ write the first species in the other parts.

Write each four times, setting the cantus firmus in each part in turn.

CANTI FIRMI

[Ill.u.s.tration: Fig. 134.]

LESSON XXIV

[Ill.u.s.tration: Fig. 135.]

EXERCISES

To cantus firmus _a_ write the first species in all parts, as in the previous lesson.

To cantus firmus _b_ write the second species in one part. Write four times, and change with each solution, so that both the cantus firmus and the second species will appear in each part. [Fig. 135.]

CANTI FIRMI

[Ill.u.s.tration: Fig. 136.]

LESSON XXV

[Ill.u.s.tration: Fig. 137.]

EXERCISES