I vi ii/IV I: what does it mean? Extracts from 52 US pop records 1957-63 illustrated with chords, teen angels, angel babies, girl groups, devotion, heartache and "all those goddam Bobbies".
2,062 + 1,396 = 3,158 YouTube viewings (2016-01-03). “This is a truly virtuosic creation: 52 pop singles in the United States that used the progression, arranged by key... Album covers, animated charts of the chord changes, and visual snippets demonstrating lyrical content flash by while you listen.” (pmgentry.net/blog/).
