What is the term for the motion of two musical lines where one line remains stationary while the other moves upward or downward?

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Multiple Choice

What is the term for the motion of two musical lines where one line remains stationary while the other moves upward or downward?

Oblique motion is when one voice stays on a single pitch while the other voice moves up or down. This creates a stationary line (a pedal point) while the other line changes, which is exactly what the scenario describes. It’s different from contrary motion, where voices move in opposite directions, and from parallel motion, where both voices move in the same direction by the same interval. Direct motion involves two voices moving in the same direction to a perfect octave or fifth, often with one voice leaping—unlike the described situation where one line doesn’t move at all. Example: a bass note held while the upper voice rises or falls.

Oblique motion is when one voice stays on a single pitch while the other voice moves up or down. This creates a stationary line (a pedal point) while the other line changes, which is exactly what the scenario describes. It’s different from contrary motion, where voices move in opposite directions, and from parallel motion, where both voices move in the same direction by the same interval. Direct motion involves two voices moving in the same direction to a perfect octave or fifth, often with one voice leaping—unlike the described situation where one line doesn’t move at all. Example: a bass note held while the upper voice rises or falls.

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