Nashville Number System Chart. This system is clearly based from the figured bass system from the Baroque music era. I IV V Roman Numerals.
4 is a G chord7 is a C chord3m is an F minor chordetc. I IV V Roman Numerals. Intros solos and codas are also clearly indicated.
In any key triads built off of the 1st In any key triads built off of the 2nd In any key a triad built off of the 7th.
It can be kind of daunting to look at all those keys at first but once you break it down its not so bad. The Nashville number system is a shorthand way to write charts for songs. Ive created a very basic version of it for handing out to your teams to get you started here is the PDF Download of the NNS Chart. Nashville Number charts are usually clearly divided into sections such as verse chorus bridge and so on.