Final answer:
The most used chords in the history of Rock and Roll are C, F, and G, which correspond to the I, IV, and V chords in the key of C. These chords form the basis of many rock song progressions.
Step-by-step explanation:
The three most used chords in the history of Rock and Roll are the I, IV, and V chords of a key, which are typically the major chords.
In the key of C, these chords are C, F, and G. This simple yet dynamic combination of chords has been the backbone of countless rock songs, forming the basis of progressions like the 12 Bar Blues and the 3 Chord Trick.
The fusion of these chords with a compelling rhythm and catchy melodies is what made rock and roll resonate with a wide audience, drawing influences from gospel, blues, country, jazz, and R&B.