Which voice in the organum carries the original chant?

In the context of organum, the term refers to a specific type of early polyphony where one or more voices are added above a plainchant melody. The original chant, known as the cantus firmus, is typically placed in the bottom voice. This foundational melody serves as the backbone around which the other voices harmonize and develop.

The bottom voice often remains more stable and is usually sung in a slower manner compared to the upper voices, which are more melodic and often fill in with additional notes that create harmonies. This structure not only preserves the integrity of the original chant but also enhances it by adding vertical harmony, creating a richer musical texture.

Therefore, identifying the bottom voice as the one carrying the original chant accurately reflects the typical practice in the composition of organum, highlighting its role in the development of Western music and choral tradition.