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→Harmonic Theory: Sub-Dominant Chord
The root of the I chord is the 5th of the IV chord, requiring no change.
The transition from IV to I is just the reverse. Stepwise motion along a scale is natural progression, in either direction. The main tension is resolving the leading tone; however, neither the I nor IV chords have the leading tone. ThusOverall, motion between moving from the I and to IV in either direction moves the song along without creating chord creates tension. The overall effect of the sub-dominant is very similar to , simply because we are moving away from the tonicchord. It sits in Similarly, the middle of the dominant and tonic, able IV - I progression tends to transition between themreduce tension.
fig 2
