This idea is mainly the one described in 8-bars blocks songs in previeous posts .
The first 4 bars, have 2 chords one per 2 bars, and the chords and melodic themes as well
have the pattern of the 8 bars
Chords A A B B
A A C C
Now each line of 4 bars (AABB, or AACC) may be conceive as a poetic line
e.g. of 15-sylables poetry .
