LESSON III

SECOND SPECIES IN BOTH PARTS[1]


[Illustration: Fig. 34.]

[1] In this and similar cases the term "species" will be
understood as referring simply to the number of notes, or to the
note-combinations, of the contrapuntal part or parts in question.
"Second species in both parts" means, therefore, that both parts
progress in half-notes.

When writing second species in both parts no cantus firmus is used, both
parts being original. One part begins on the first beat, the other may
begin on either the first or second beat. [Fig. 35.]

[Illustration: Fig. 35.]

The interval formed by the two notes appearing on the second beat should be
a consonance, or one of the following dissonances: The augmented fourth,
the diminished fifth, the minor or diminished seventh when properly
resolved, and the perfect fourth when approached in contrary motion.

All tones not belonging to the harmony implied on the first beat, must be
treated as dissonances. [Fig. 36.]