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Regarding the doubling of 3rds, you have a lot of flexibility in melody lines or chords if there is a solid root in the bass, in your case C. But if there is a 3rd in the bass, and this generally denotes a moving bass, you must be careful not to double the 3rd elsewhere in the music. In fact, when this is the case, it is helpful to double the fifth of the chord or the root in order to offset the 3rd, which is not considered a strong root. In the example, which progression sounds bad to your ears?