自由版圖

對位法

Counterpoint

Independence of parts

Harmonic interval和聲音程

Won’t use:

2^nd, 4^th, 7^th, intervals

Can use:

The unison, minor & major 3^rd, 5^th, minor & major 6^th, and the octave intervals

增加獨立性的作法：

上、下聲部反向進行one voice goes down, the other goes up

避免連續超過3個：平行三度 (consecutive) parallel third, 平行六度(consecutive) parallel sixth

perfect consonance避免：平行五度 parallel fifth, 平行八度 parallel eighth, 平行五度接平行八度parallel fifth followed by parallel eighth