There are 3 basic guitar chords or in most popular songs. (Well if there is a guitar part in the song. These days most popular songs don't have guitar parts, they are done digitally on a computer or synthesizer). The Nashville number system is a good way to explain this. Most popular rock and country songs have a standard 1,4,5, or some variation of the three with a minor 7th added for a little
. flavor. eg; A song in the key of D will have D,A, and G, Then maybe a Bm added.
