<html><head><style type='text/css'>p { margin: 0; }</style></head><body><div style='font-family: times new roman,new york,times,serif; font-size: 12pt; color: #000000'><div><font face="times new roman, new york, times, serif">Regarding the [I - V - vi - IV] chord progression/cycle/sequence/sucession so thoroughly discussed, I would like to add my perspective. After watching the entertaining video with multiple examples of primarily rock/pop songs that use the [whatever you choose to call it] of four chords - I have another perspective. A fundamental aesthetic of pop/rock music is a strong signature root position progression pattern/shape. With very few exceptions root position movement between chord degrees is the choice of pop/rock musicians. While more sophisticated rock groups do use inversions for musical content, or perhaps some piano oriented artists like Elton Johns or Billy Joel, the reliance on simplicity and power of a strong [call it what you want] is important and codified in the style. This sequence of chords certainly meets those requirements with a descending <b>4th</b> to the V chord, followed by another of the strongest root movements (according to Schoenberg) - an ascending <b>whole step</b> followed by another varied interval of descending <b>major 3rd</b> to the IV chord before returning via <b>5th</b> to the I. Each chord is arrived at by a different interval, which might sustain the interest and keep the listener attentive and has similarity to the ground bass as material is varied over the [whatever you choose to call it]. A <b>strong signature root movement pattern</b> is evident in many pop/rock hits including this [whatever you choose to call it]. </font></div><div><font face="times new roman, new york, times, serif"><br></font></div><div><font face="times new roman, new york, times, serif">Carson Farley</font></div><div><font face="times new roman, new york, times, serif">Composer/cellist/theorist</font></div><div><font face="times new roman, new york, times, serif">University of Washington Alumni - music theory/history</font></div></div></body></html>