2002 August 1, gb, “Any sites with progression examples?”, in alt.guitar.beginner[1] (Usenet):
Does anyone know of a good site with examples of common progressions? For instance I saw I,VI,IV,V7 referred to as the Heart and Soul progression and as a common 50's progression.
2008 September 25, js, “Practical bass skills”, in alt.guitar.bass[2] (Usenet):
D | Bmin | G | A :|| = I vi IV V in D. Classic 50's progression. The V-I cadence "wraps around" so that it resolves to the first chord each time.
2018, Kenneth P. Langer, A Theory For All Music, book 4, Lulu.com, →ISBN, page 200:
