Johan is right. A chord progression is several chords played in sequence.

Lots of songs have this chord progression
G / / / / C / / / / D / / / / G / / / /
repeated over and over. This progression is played in the key of G. You know the key is G because the first chord is G and the G is played more than any other chord.

To prove you're in G, try this experiment:

play the progression 3.5 times thru, stopping on the D chord. Let the D ring out.

Does it sound like you are done?

Now play the G and let it ring out.
Now it sounds "done."


This progression is called a I IV V (one four five) and is extremely popular.

It is I IV V because it uses the first fourth and fifth chords in the scale.

G A B C D E F G
1 2 3 4 5 6 7 1
G C D

In A, a I IV V would be A D E

A B C D E F G A
1 2 3 4 5 6 7 1
A D E

Does this all make sense?

Jon