This is in response to a presentation I saw in 2008 at a Fest for Beatles Fans where I particularly noticed a parallel between  "A Whiter Shade of Pale" by Procul Harum and "Mind Games" by John Lennon.  Not part of that presentation, but subsequently thought of by me, was a parallel between "Baby's in Black" (Beatles, with the lyric "Oh how long will it take") and "No Matter What" (Badfinger, in a very Beatles-sounding recording on the Beatles' Apple label, with the lyric "Break down the old gray wall").  And the page you are on is dealing with the bass-line progression (found in "mystery line" selection below) of : A, then 1/2 step down to A flat, then 1/2 step down to G, then a fifth down to C (yes, this can be transposed). 

ALMOST the same progression is found in "canned music excerpt", which I heard in 1979: twice at the Acme supermarket in the Elkton Road shopping center in Newark, Delaware, and once at the Gino's at 11th and French streets in Wilmington, Delaware.  At this writing on 3 May 2008, the Acme chain still exists, but the two locations mentioned in the paragraph you are reading have long since closed. The selection had been done in 1979 on the University of Delaware PLATO system using a sawtooth waveform (sounding like a clarinet), and is done here using Hammond organ instead.

The other entries exist elsewhere on this site: 2 versions of God Bless America, along with King Porter Stomp (on the Benny Goodman page) and my own arrangement of Route 66 (on the page of that name).