8,720
edits
Changes
m
The F is a perfect fourth interval above C. In the key 4th note of the C Major, the scale. The F Major chord is thus called the ''<u>IV chord'' </u> (that's the roman numeral four, not "ivv"the letters 'i' and 'v'). Its notes are the perfect 4th, major 6th, and octave (tonic) above the tonic note of the key.
The transition C F A C - Notes B--1----6----10---13- |-P4-| \ |---M6----| > distances from a I chord to a IV chord involves moving the 3rd of the I chord up a half step to become the root of the IV chord and the 5th of the I up a whole step to become the 3rd tonic note of the IV. This is a stepwise motion for a minor third interval to a major third interval. For example, in the key of C Major, key |-----Oct------| / U \ |-M3-| > distances from the E and G root note of the I chord are a minor third. They ascend to F and A, a major third.chord |---P5----| /
→Harmonic Theory: Sub-Dominant Chord
|F Major Chord#Harmonic Theory: Sub-Dominant Chord|Theory: Sub-Dominant}}
The transition from a I chord to a IV chord involves moving the 3rd of the I chord (E) up a half step to become the root of the IV chord (F) and the 5th of the I (G) up a whole step to become the 3rd of the IV (A). This is a <u>stepwise motion</u> for a minor third interval to a major third interval. ''That means each note moves one note in the scale in the same direction.'' For example, in the key of C Major, the E and G of the I chord are a minor third. They ascend to F and A, a major third. 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. Overall, moving from the I to IV chord creates tension, simply because we are moving away from the tonic chord. Similarly, the IV - I progression tends to reduce tension.