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Adrian, Ethel, Glenn, and Joan are each writing compositions in the key of C major. Which composer is using the MOST common chord progression?

The most common chord progression in the key of C major is the I-IV-V-I progression. This progression consists of the chords C major, F major, and G major.

If Adrian, Ethel, Glenn, and Joan are all writing compositions in the key of C major, the composer using the most common chord progression would be the one using the I-IV-V-I progression the most frequently in their composition.