To cantus firmus a write second species in one part and fourth in the other. [Fig. 124_b_.]

To cantus firmus b write third species in one part and fourth in the other. [Fig. 124_c_.]

[Illustration:  Fig. 124.]

CANTI FIRMI

[Illustration:  Fig. 125.]

LESSON XIX

FIFTH SPECIES

[Illustration:  Fig. 126.]

No suggestions other than have already been given for two- and three-part counterpoint are necessary for this species.

EXERCISES

To canti firmi a and b write fifth species in one part.  Write each three times, as usual.

CANTI FIRMI

[Illustration:  Fig. 127.]

LESSON XX

FIFTH SPECIES (Continued)

EXERCISES

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.]

[Illustration:  Fig. 128.]

CANTI FIRMI

[Illustration:  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).

[Illustration:  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.

[Illustration:  Fig. 131.]

SIMPLE COUNTERPOINT IN FOUR PARTS

LESSON XXIII

[Illustration:  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 deg., use the latter, as in Fig. 133.