Progression from one chord to another is called Harmonic progression; from
one tone to another, Melodic progression.

In melodic progression all major, minor, perfect and diminished intervals
are allowed except the major and minor seventh. The minor seventh may,
however, be used when harmony does not change (_a_). [Fig. 4.]

[Illustration: Fig. 4.]

In counterpoint there are Five Species, or orders. When the counterpoint
has one note for each note of the cantus firmus, it is of the First Species
(_a_); if it has two notes for each note of the cantus firmus, it is the
Second Species (_b_); if four notes, the Third Species (_c_); if two notes
syncopated, the Fourth Species (_d_); and a mixture of these species is the
Fifth Species, or Florid Counterpoint (_e_). [Fig. 5.]

[Illustration: Fig. 5.]




SIMPLE COUNTERPOINT IN TWO PARTS

FIRST SPECIES


Two-part counterpoint comprises a cantus firmus and a counterpoint. [Fig.
6.]