[Cecil6243]

So a chord progression is where the chords fall in the note sequence of a scale for the particular key, i.e. in the key of C if the chords in a song are C, F, and G it'a a I IV V right?

But what if let's say the chords in a song are EM C D and G in that order in the key of G what is it? Is it a I, IV, V, vi even though the chord progress is not in that order? I assume you start out with the chord that corresponds with the key which in this case would be a G?

Anybody have a iink that explains this well?