The I-iii-IV progression refers to a chord progression commonly used in popular music where the tonic (I), mediant (iii), and subdominant (IV) chords are played sequentially.
Chord Progression: A series of chords played in succession that forms the harmonic foundation of a piece of music.
Mediant Chord: The mediant chord is built on the third scale degree of a major or minor key.
Subdominant Chord: The subdominant chord is built on the fourth scale degree of a major or minor key.
AP Music Theory - 5.4 The iii (III) Chord
AP Music Theory - Unit 5 Overview: Harmony and Voice Leading II (Chord Progressions and Predominant Function)
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