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48 Bass Accordion Chart – 12×4

    The 48 bass (12×4) layout has 2 columns of single bass notes (Roots – also called Bass buttons – and Counter Basses), 2 columns of chords (Major, minor), and 12 rows. Compared to the smaller model (the 40 bass layout), it can’t play Dominany 7th nor diminished chords but it has a complete set of bass keys. The other 48 bass accordion model, the 8×6 layout, has 2 extra columns of chords (Dominant 7th and diminished 7th) but it doesn’t have a full set of keys as the 12×4 layout. The 48 bass accordion is considered a good instrument for beginners because it’s small, light, and easy to hold.

     

    If you are totally new to the Stradella bass system, read this article.

     


    48 Bass Accordion 12×4 Layout

    48 bass accordion chart 12x4 layout

    On the left, you can see a 48 bass (12 x4) layout, overlaid with a 120 bass layout. The chart on the right shows you which notes are played by each button.



    All chords you can play on a 48 (12×4) Bass Accordion

    There are two columns of standard chords:

    • 12 major chords
    • 12 minor chords

    in all keys, however, combining chords and roots (or counter basses) you can get:

    • 10 Dominant 9th/11th chords
    • 11 Dominant 9th chords
    • 11 Major 7th/9th chords
    • 11 minor(Major 9th) chords
    • 11 minor 9th chords
    • 12 minor 7th chords
    • 12 Half-diminished chords
    • 16 Major 6th chords
    • 16 Major 7th chords

     


    How to read the lists of chords

    Here are some guidelines to help you read the following lists of chords and charts:

    • Flats and sharps are paired with their enharmonic equivalent chord, for example, C#Maj7 = DbMaj7
    • Chords that can be played are clickable and are colored in blue, for example, DMaj 
    • Missing chords are colored in gray and are crossed out by a horizontal line, for example, Bdim7. 
    • Duplicated chords are colored in light blue, for example, E#m7 = Fm7
    • Some chords can be played in two different ways: by combining a chord with a bass note or by combining a chord with a counter-bass button. For this reason, you’ll find two lists for the same group of chords, one for those that can be played combining a counter bass with a chord (“On Counter Bass” list) and one for those chords that can be played combining a bass note (“On Root” list).
    • The charts of those extended chords that can be built combining a chord with a counter bass or with a bass note, show both positions: counter basses are circled in blue, and basses are circled in green.
    Cm7b5 chord position

    You can play the root on the bass row or on the counter bass.

     


    Standard chords

    12 Major chords

    Major chords are built with a Root (R), a major third (3rd), and a perfect fifth (5th).

     

    On a 48 bass accordion (12×4 layout) you can play these Major chords:

     

    • F#Maj = GbMaj
    • BMaj              
    • EMaj              
    • AMaj              
    • DMaj              
    • GMaj              
    • CMaj              
    • FMaj              
    • BbMaj = A#Maj  
    • EbMaj = D#Maj  
    • AbMaj = G#Maj  
    • DbMaj = C#Maj   

     


    12 Minor chords

    Minor chords are built with a Root (R), a minor third (m3rd), and a perfect fifth (5th).

     

    On a 48 bass accordion (12×4 layout) you can play these minor chords:

     

    • F#m = Gbm
    • Bm           
    • Em           
    • Am           
    • Dm           
    • Gm           
    • Cm           
    • Fm           
    • Bbm = A#m
    • Ebm = D#m
    • Abm = G#m
    • Dbm = C#m 

     



    Combined Chords

    10 Dominant 9th/11th chords

    The Dominant 9th/11th chord is a dominant 7th chord with a major 9th (same as a 2nd) and an 11th (same as a 4th) added.

    It is built with a Root (R), a major third (3rd), a perfect fifth (5th), a minor 7th ( m7th), a major ninth (9th), and an eleventh (11th).

    On the accordion, you can play a Dominant 9th/11th chord by combining a Root and its major chord with the major chord built on its minor 7th interval, for example, C + CMaj + BbMaj  = C9/11.

    The 11th is dissonant in major and dominant chords because the 11th and the major 3rd are adjacent tones, for example, C9/11 = C, E, G, Bb, D, F.

     

    On a 48 bass accordion (12×4 layout) you can play these Dominant 9th/11th chords:

     

    • F#9/11 = Gb9/11
    • B9/11               
    • E9/11               
    • A9/11               
    • D9/11               
    • G9/11               
    • C9/11               
    • F9/11               
    • Bb9/11 = A#9/11
    • Eb9/11 = D#9/11
    • Ab9/11 = G#9/11
    • Db9/11 = C#9/11 

     


    11 Dominant 9th chords

    A Dominant 9th chord is a Dominant 7th chord with a Major 9th added.

    It is built with a Root (R), a major third (3rd), a perfect fifth (5th), a minor seventh (m7th), and a major ninth (9th).

    On the Stradella bass system, you can play a Dominant 9th chord by combining a Root and its major chord with the minor chord built on its 5th interval, for example, C + CMaj + Gm = C9.

     

    On a 48 bass accordion (12×4 layout) you can play these Dominant 9th chords:

     

    • F#9 = Gb9
    • B9         
    • E9         
    • A9         
    • D9         
    • G9         
    • C9         
    • F9         
    • Bb9 = A#9
    • Eb9 = D#9
    • Ab9 = G#9 
    • Db9 = C#9  

     


    11 Major 7th/9th chords

    The Major 7th/9th chord (Maj7/9) is a Major 7th chord with a major 9th added.

    It is built with a Root (R), a major third (3rd), a perfect fifth (5th), a major seventh (7th), and a major ninth (9th).

    On the accordion, you can play a Major 7th/9th chord by combining a Root and its Major chord with the Major chord built on the 5th interval from the Root, for example, C + CMaj + GMaj = CMaj7/9.

     

    On a 48 bass accordion (12×4 layout) you can play these Major 7th/9th chords:

     

     


    11 minor(Major 9th) chords

    The minor(Major 9th) chord is a minor 7th chord with a major 9th added.

    It is built with a Root (R), a minor third (m3rd), a perfect fifth (5th), a minor seventh (m7th), and a major ninth (9th).

    On the accordion, you can play a minor(Major 9th) chord by combining a Root and its minor chord with the Major chord built on its 5th interval, for example, C + Cmin + GMaj = Cm(Maj9)

     

    On a 48 bass accordion (12×4 layout) you can play these minor(Maj9) chords:

     

     


    11 minor 9th chords

    A minor 9th chord is a minor chord with a minor 7th and a major 9th added.

    It is built with a Root (R), a minor third (m3rd), a perfect fifth (5th), a minor seventh (m7th), and a major ninth (9th).

    On the Stradella bass system, you can play a minor 9th chord by combining a Root and its minor chord with the minor chord built on the 5th interval, for example, C + Cm + Gm = Cm9.

     

    On a 48 bass accordion (12×4 layout) you can play these minor 9th chords:
    • F#m9 = Gbm9
    • Bm9             
    • Em9             
    • Am9             
    • Dm9              
    • Gm9              
    • Cm9              
    • Fm9              
    • Bbm9 = A#m9 
    • Ebm9 = D#m9 
    • Abm9 = G#m9 
    • Dbm9 = C#m9  

     


    12 minor 7th chords

    A minor 7th chord is a minor chord with a minor 7th added.

    It is built with a Root (R), a minor third (m3rd), a perfect fifth (5th), and a minor seventh (m7th).

    On the Stradella bass system, you can play a minor 7th chord by combining a Root with the Major chord built on its minor 3rd interval, for example, C + EbMaj = Cm7.

     

    On a 48 bass accordion (12×4 layout) you can play these minor 7th chords:

     

    On Counter Bass:

    • D#m7 = Ebm7
    • G#m7 = Abm7
    • C#m7 = Dbm7
    • F#m7 = Gbm7
    • Bm7             
    • Em7             
    • Am7             
    • Dm7             
    • Gm7             
    • Cm7             
    • Fm7             
    • Bbm7 = A#m7 

     

    On Root:

    • F#m7 = Gbm7
    • Bm7             
    • Em7             
    • Am7             
    • Dm7             
    • Gm7             
    • Cm7             
    • Fm7             
    • Bbm7 = A#m7
    • Ebm7 = D#m7
    • Abm7 = G#m7
    • Dbm7 = C#m7 

     


    12 Half-diminished chords

    The minor 7th flat 5th chord (half-diminished) is a minor chord with a flat 5th and a minor 7th added.

    It is built with a Root (R), a minor third (m3rd), a diminished fifth (d5th), and a minor seventh (m7th).

    On the accordion, you can play a Half-diminished chord by combining a Root with the minor chord built on its minor 3rd interval, for example, C + Ebm = Cm7b5

     

    On a 48 bass accordion (12×4 layout) you can play these minor 7th flat 5th chords:

     

    On Counter Bass:

    • D#m7b5 = Ebm7b5
    • G#m7b5 = Abm7b5
    • C#m7b5 = Dbm7b5
    • F#m7b5 = Gbm7b5
    • Bm7b5                 
    • Em7b5                 
    • Am7b5                 
    • Dm7b5                 
    • Gm7b5                 
    • Cm7b5                 
    • Fm7b5                 
    • Bbm7b5 = A#m7b5 

     

    On Root:

    • F#m7b5 = Gbm7b5
    • Bm7b5                 
    • Em7b5                 
    • Am7b5                 
    • Dm7b5                 
    • Gm7b5                 
    • Cm7b5                 
    • Fm7b5                 
    • Bbm7b5 = A#m7b5
    • Ebm7b5 = D#m7b5
    • Abm7b5 = G#m7b5
    • Dbm7b5 = C#m7b5 

     


    16 Major 6th chords

    The Major 6th chord is a Major chord with a major 6th added.

    It is built with a Root (R), a major third (3rd), a perfect fifth (5th), and a major sixth (6th).

    On the accordion, you can play a Major 6th chord by combining a Root with the minor chord built on its 6th interval, for example, C + Am = C6.

     

    On a 48 bass accordion (12×4 layout) you can play these Major 6th chords:

     

    On Counter Bass:

    • A#6 = Bb6
    • D#6 = Eb6
    • G#6 = Ab6
    • C#6 = Db6
    • F#6 = Gb6
    • B6         
    • E6         
    • A6         
    • D6         
    • G6         
    • C6         
    • F6         

     

    On Root:

    • F#6 = Gb6
    • B6          
    • E6          
    • A6          
    • D6          
    • G6          
    • C6          
    • F6          
    • Bb6 = A#6 
    • Eb6 = D#6 
    • Ab6 = G#6 
    • Db6 = C#6  

     


    16 Major 7th chords

    The Major 7th chord is a Major chord with a major 7th added.

    It is built with a Root (R), a major third (3rd), a perfect fifth (5th), and a major seventh (7th).

    On the accordion, you can play a Major 7th chord by combining a Root with the minor chord built on its 3rd interval, for example, C + Em = CMaj7.

     

    On a 48 bass accordion (12×4 layout) you can play these Major 7th chords:

     

    On Counter Bass:

    • A#Maj7 = BbMaj7
    • D#Maj7 = EbMaj7
    • G#Maj7 = AbMaj7
    • C#Maj7 = DbMaj7
    • F#Maj7 = GbMaj7
    • BMaj7                
    • EMaj7                
    • AMaj7                 
    • DMaj7                 
    • GMaj7                 
    • CMaj7                 
    • FMaj7                 

     

    On Root:

    • F#Maj7 = GbMaj7
    • BMaj7                
    • EMaj7                
    • AMaj7                
    • DMaj7                
    • GMaj7                
    • CMaj7                
    • FMaj7                
    • BbMaj7 = A#Maj7
    • EbMaj7 = D#Maj7
    • AbMaj7 = G#Maj7
    • DbMaj7 = C#Maj7 

     

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