For anyone wanting to take a deep dive into the Nashville numbering system, +++ The Nashville Number System +++ by Chas Williams.

One of the unique features of this book is the book includes a CD song collection with each song charted by five notable session arrangers. Ten arrangers in all charted songs for this book.

The idea is that you ll be able to compare, side by side, some of the different styles of notation and symbols you can use to chart the same piece of music. So, as you listen to a song on the cd, you can flip between different charts written of the same song.
These different charts represent the kinds of numbering techniques that you are liable to run into in almost all of the major recording and television studios, clubs, showcases, rehearsal halls, and other situations where music is performed in Nashville.

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