Michal, re: your question …
Here are the ten progressions using Roman numerals.
Important: Justin uses all CAPITALS for both major and minor chords.
I am going to change that (for ease of reading) so that major chords are upper case and minor chords are lower case.
1] I - V - vi - IV
2] I - vi - ii - V
3] I - vi - IV - V
4] I - vi - iii - V
5] I - iii - IV - V
6] I - V - IV - V
7] I - V- ii - IV
8] iii - vi - ii - V
9] vi - IV - V - I
10] I - IV - I - V
The chord you have learned can be placed in several common keys. Doing so will allow you to see which is the I, which the ii, the ii, the IV, the V and the vi. The vii (diminished chord) is not included).
Key of A:
A, Bm, C#m, D, E, F#m
Key of C:
C, Dm, Em, F, G, Am
Key of D
D, Em, F#m, G, A, Bm
Key of E
E, F#m, G#m, A, B, C#m
Key of G
G, Am, Bm, C, D, Em
I have typed in bold font the chords you can currently play.
In the key of A they are I, IV and V.
In the key of C they are all chords I to vi.
In the key of D they are I, ii, IV and V.
In the key of E they are just I and IV.
In the key of G they are I, ii, IV, V and vi.
I hope that helps.
Cheers
| Richard | JustinGuitar Approved Teacher, Official Guide & Moderator