Stradella bass system
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The Stradella Bass System (sometimes called standard bass) is a buttonboard layout equipped on the bass side of many accordions, which uses rows of buttons arranged in a circle of fifths; this places the principal major and minor chords of a key (I, IV and V) in three adjacent rows. Each row contains, in order:
- The major third above the root ("counter-bass")
- The root note
- The major chord
- The minor chord
- The dominant seventh chord
- The diminished seventh chord
The following chart shows a standard 120-button Stradella layout.
In modern accordions, each chord button sounds three individual pitches. Early accordions sounded four pitches for the seventh and diminished chords[citation needed]. Modern Stradella systems omit the 5th from these two chords[citation needed], allowing for more versatility. For example, an augmented seventh chord can be created by using the dominant seventh chord button and adding an augmented 5th from the right-hand manual or from one of the bass or counterbass buttons.
In most Russian layouts the diminished seventh chord row is moved by one button[citation needed], so that the C diminished seventh chord is where the F diminished seventh chord would be in a standard Stradella layout; this is done in order to achieve a better reachability with the forefinger.
Contents |
[edit] Register switches
The larger and more expensive accordions can also have on the Stradella bass side, some Register switches, similar in concept to the treble register switches
[edit] Common configurations
| Name | Columns | Rows of bass-notes | Rows of chords |
|---|---|---|---|
| 8-bass | 4 - Root notes: F to D | Root note | Major |
| 12-bass | 6 - Root notes: B♭ to A | Root note | Major |
| 24-bass | 8 - Root notes: E♭ to E | Root note | Major, minor |
| 32-bass | 8 - Root notes: E♭ to E | Root note | Major, minor, 7th |
| 40-bass | 8 - Root notes: E♭ to E | Major 3rd note, root note | Major, minor, 7th |
| 48-bass | 8 - Root notes: E♭ to E | Major 3rd note, root note | Major, minor, 7th, diminished |
| 12 - Root notes: D♭ to F♯ | Major 3rd note, root note | Major, minor | |
| 60-bass | 12 - Root notes: D♭to F♯ | Major 3rd note, root note | Major, minor, 7th |
| 72-bass | 12 - Root notes: D♭ to F♯ | Major 3rd note, root note | Major, minor, 7th, diminished |
| 80-bass | 16 - Root notes: C♭ to G♯ | Major 3rd note, root note | Major, minor, 7th |
| 96-bass | 16 - Root notes: C♭ to G♯ | Major 3rd note, root note | Major, minor, 7th, diminished |
| 120-bass | 20 - Root notes: Low A to A♯ | Major 3rd note, root note | Major, minor, 7th, diminished |
| 140-bass | 20 - Root notes: Low A to A♯ | Major 3rd note[notes 1], root note | Major, minor, 7th, diminished, augmented[notes 1] |
| 160-bass | 20 - Root notes: Low A to A♯ | Three major 3rd rows, root note | Major, minor, 7th, diminished |
[edit] Notes
- ^ a b 140-bass accordions may come with either an extra major 3rd note row, located between the regular major 3rd row and the root note, or an augmented 7th chord row.
[edit] References
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