The C Mixolydian no 4 Scale as one would find it on any conventionally tuned, equal tempered instrument. Cognitively, the ear perceives the perfect fourth as utonal. Removing it tends to brighten the overall harmonic hue just a touch. This effect is less clear with equal temperament. But the perfect fourths and fifths are pretty close to their just counterparts in 12-tone equal tempered systems, allowing the human auditory system to perceive the "brightness" of a perfect fifth without it's counter-balancing inversion.
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