Here is a grid I made in order to organize chord progressions of musical compositions. This will help see what "path" other works are taking. The "ROMAN NUMERAL" system Back used is interesting to me in what chords are used behind the tune. "The Melody is to the driver singing what the Chord Progression is to the street taken". This is taken from "Scott Joplin Complete Piano Rags" after the introduction before the "School of Ragtime" by Scott Joplin
