固定旋律，固定曲调：与对位声部一起作为一首复调音乐基础的一段素歌旋律，如在5世纪复调音乐中。
A plainsong melody serving as the basis of a polyphonic composition by the addition of contrapuntal voices, as in 5th-century polyphony.
这种早期的复调音乐建立在三个简单和三个复合的音程的基础之上。
This early polyphony is based on three simple and three compound intervals.
这种早期的复调音乐建立在三个简单和三个复合的音程的基础之上。
This early polyphony is based on three simple and three compound intervals.
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