12 Bar chord Progression in "G"

How hard is it?

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How to read this tab — notation key

+: Blow note
−: Draw note
b or ': Half-step bend
bb or '': Two half-step bend
bbb or ''': Three half-step bend
(###): Chord — relevant hole numbers in parentheses
< or *: Push the button in (chromatic harmonica)

Full reference and posting tips in the tab guide.

Tab

Use a C harp, you will be playing cross harp in the key of G

There have been a few questions about chords,
keys and 12 bar I hope this helps.

-(1234)-(1234)-(1234)-(1234)
-(1234)-(1234)-(1234)-(1234) G (I) Chord
-(1234)-(1234)-(1234)-(1234)
-(2345)-(2345)-(2345)-(2345) G7 (17)Chord

(2345) (2345) (2345) (2345)
(2345) (2345) (2345) (2345) C (IV) Chord

-(1234)-(1234)-(1234)-(1234) 
-(1234)-(1234)-(1234)-(1234) G (1) Chord

-(1 or 4)-(1 or 4)-(1 or 4)-(1 or 4) D7 (V7)Chord

Draw either hole 1 or hole 4they are both D
notes.

(2345) (2345) (2345) (2345) C (IV) Chord

-(1234)-(1234)-(1234)-(1234) 
-(1234)-(1234)-(1234)-(1234) G (I) Chord

With the D7 (V7) bar instead of playing the
first OR fourth hole every time alternate and play
 -3 -4 b-4 -3 to add a bit of colour

Other ways to play these Chords is
G Chord -(123)or -(234) G7 Chord -(2345)draw
C Chord (123)or (234)or(3456) blow
G(I) Tonic  C(IV) Sub-dominant  D7(V7)Dominant 7

When the guitar player plays in G 12 bar you can join in with this

Play on a harmonica— watch which holes to blow & draw, with sound