Drew Johnson 1 December 2011
Extended plagal progressions are recurring in many standards. A plagal cadence is the motion from the IV chord to the I chord. Some tunes that have extended plagal cadences are... Blues for Alice, All of Me, All the Things You Are, Emily, etc. Once you pick this sound out, you will hear it all the time... it usually just sounds like a chromatic walk down, and in a lot of ways, that is really all it is.
Here are some lines that are a jumping off point for tackling this progression. This was compiled by Bert Ligon.
Hope ya dig it!