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80 Bass Accordion Chart

    The 80 bass layout has 2 columns of single bass notes (Roots – also called Bass buttons – and Counter Basses), 3 columns of chords (Major, minor, Dominant 7th), and 16 rows. Compared to the smaller model (the 72 bass layout), it can’t play diminished chords but has 4 extra bass keys. Note that it may still be able to play diminished chords if the 7th chord buttons are omitting the Root:

    Root omitted on 7th chords (French layout)

    Some 80 bass accordions play a different triad on the 7th chord bass buttons: instead of playing the Root, the 3rd, and the 7th omitting the 5th, they play the 3rd the 5th, and the 7th omitting the Root. This notes arrangement derives from the 3 +3 French bass system (3 columns of bass notes: minor 3rd, major 3rd, and Roots and 3 columns of chords: Major, minor, and 7th).

    This is a very clever layout that allows you to play both 7th chords and diminished chords on accordions with just three columns of chords. As a matter of fact, the 3rd, the 5th, and the 7th notes of a 7th chord also form a diminished triad that can be combined with a bass note to form a diminished chord.

     

    Diminished chords on the French layout

    Despite the lack of diminished chord buttons, you can play them by combining a Root with the 7th chord of its 4th interval (which is found just below the Root line). For example, F7 plays these notes: A, C, Eb
    Playing C + F7 you get a Cdim7(5th omitted) because A became the diminished 7th, C doubles the root, and Eb is the minor 3rd. 

     

    Dominant 7th chords on the French layout

    On these models of accordion, the 7th chords are complete since you can play the Root on the bass column and the 3rd, the 5th, the 7th by pushing the 7th chord button.  

     

    Combined chords on the French layout

    If your 7th chord buttons play the 3rd, the 5th, and the 7th, all combinations of chords presented here are still valid with the exception of 7b5 chords.

     

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

     


    80 Bass Accordion Layout

    (Click to enlarge)

    80 bass accordion chart layout

    On the left, you can see an 80 bass 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 an 80 Bass Accordion

    There are three columns of standard chords:

    • 16 Major chords
    • 16 Minor chords
    • 16 Dominant 7th chords

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

    • 14 Dominant 7th flat 5th chords
    • 14 Dominant 9th/11th chords
    • 15 Dominant 9th chords
    • 15 Major 7th/9th chords
    • 15 minor(Major 9th) chords
    • 15 minor 9th chords
    • 16 Major 6th chords
    • 16 Major 7th chords
    • 16 minor 7th chords
    • 16 Half-diminished 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

    16 Major chords

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

     

    On an 80 bass accordion you can play these Major chords:

     

     


    16 Minor chords

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

     

    On an 80 bass accordion you can play these minor chords:

     

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

     


    16 Dominant 7th (5th omitted)* chords

    Dominant 7th chords are Major chords with a minor 7th added.

    Dominant 7th chords are built with a Root (R), a major third (3rd), a perfect fifth (5th) and a minor seventh (m7th).

    The 7th chord buttons on the Stradella bass system play just the root, the 3rd, and the 7th. The 5th is omitted.

    *NOTE: In case the 7th chord buttons are omitting the Root instead of the 5th (French layout), you can get full 7th chords by playing a bass Root and its 7th chord which contains the 3rd, the 5th, and the 7th.

     

    On an 80 bass accordion you can play these Dominant 7th chords:

     

    • G#7 = Ab7
    • C#7 = Db7
    • F#7 = Gb7
    • B7         
    • E7         
    • A7         
    • D7         
    • G7         
    • C7         
    • F7         
    • Bb7 = A#7
    • Eb7 = D#7
    • Ab7 = G#7
    • Db7 = C#7
    • Gb7 = F#7
    • Cb7 = B7  

     



    Combined Chords

    14 Dominant 7th flat 5th chords*

    The Dominant 7th flat 5th chord (7b5) is a Dominant 7th chord with a flat 5th added.

    It is built with a Root (R), a major third (3rd), a diminished fifth (d5th), and a minor seventh (m7th).

    On the accordion, you can play a 7b5 chord by combining a Root with the Dominant 7th chord built on its flat 5th interval, for example, C + Gb7 = C7b5. C is the Root and Gb is the flat 5th of C.

    *NOTE: In case the 7th chord buttons are omitting the Root instead of the 5th (French layout), you can’t play 7b5 chords as shown in these charts.

     

    On an 80 bass accordion you can play these Dominant 7th flat 5th chords:

     

    On Counter Bass:

    On Root:

    • G#7b5 = Ab7b5
    • C#7b5 = Db7b5
    • F#7b5 = Gb7b5
    • B7b5             
    • E7b5             
    • A7b5             
    • D7b5             
    • G7b5             
    • C7b5             
    • F7b5             
    • Bb7b5 = A#7b5 
    • Eb7b5 = D#7b5 

     


    14 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 an 80 bass accordion you can play these Dominant 9th/11th chords:

     

     


    15 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 an 80 bass accordion you can play these Dominant 9th chords:

     

    • C#9 = Db9
    • F#9 = Gb9
    • B9         
    • E9         
    • A9         
    • D9         
    • G9         
    • C9         
    • F9         
    • Bb9 = A#9
    • Eb9 = D#9
    • Ab9 = G#9
    • Db9 = C#9
    • Gb9 = F#9
    • Cb9 = B9  

     


    15 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 an 80 bass accordion you can play these Major 7th/9th chords:

     

     


    15 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 an 80 bass accordion you can play these minor(Maj9) chords:

     

     


    15 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 an 80 bass accordion you can play these minor 9th chords:

     

    • C#m9 = Dbm9
    • F#m9 = Gbm9
    • Bm9             
    • Em9             
    • Am9             
    • Dm9             
    • Gm9             
    • Cm9             
    • Fm9             
    • Bbm9 = A#m9
    • Ebm9 = D#m9
    • Abm9 = G#m9
    • Dbm9 = C#m9
    • Gbm9 = F#m9
    • Cbm9 = Bm9   

     


    20 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 an 80 bass accordion you can play these Major 6th chords:

     

    On Counter Bass:

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

     

    On Root:

    • B6         
    • E6         
    • A6         
    • D6         
    • G6         
    • C6         
    • F6         
    • Bb6 = A#6
    • Eb6 = D#6
    • Ab6 = G#6
    • Db6 = C#6
    • Gb6 = F#6
    • Cb6 = B6  

     


    20 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 an 80 bass accordion you can play these Major 7th chords:

     

    On Counter Bass:

     

    On Root:

     


    16 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 an 80 bass accordion you can play these minor 7th chords:

     

    On Counter Bass:

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

     

    On Root:

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

     


    16 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 an 80 bass accordion you can play these minor 7th flat 5th chords:

     

    On Counter Bass:

     

    On Root:

     

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