MUSIC THEORY FUNDAMENTALS - Chapter 8, Exercise 1 Solution
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Writing Out I-IV-V-I in C Major

PROBLEM
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Using Chapter 7's own C major diatonic chords, write out the actual
chord names (not just Roman numerals) for a I-IV-V-I progression in C
major.

SOLUTION
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Chapter 7 established the full set of C major diatonic chords:

    I = C major        ii = D minor       iii = E minor
    IV = F major        V = G major       vi = A minor
    vii° = B diminished

Looking up each Roman numeral in the I-IV-V-I progression:

    I  -> C major
    IV -> F major
    V  -> G major
    I  -> C major

ANSWER: I-IV-V-I in C major is C major - F major - G major - C major.

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WHY THIS WORKS AS AN ANSWER

This is a direct lookup against Chapter 7's own real diatonic-chord
derivation for C major. I-IV-V-I is one of the most fundamental
progressions in tonal music precisely because it uses only the three
major chords available in a major key (the tonic, subdominant, and
dominant), moving away from and back to the tonic in the simplest
possible real harmonic loop.