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Multi-row systems can be divided into two broad classes: "fourth-apart" systems and "semitone-apart" systems.Fourth-apart systems are the most widespread form of multi-row DBA.
Since the mid-to-late 19th century, instruments have been produced with more than one row in order to give players a greater choice of scales and tonalities.
Because each button produces two notes, the diatonic scale can be covered in four buttons on a melody row.
For example, on a melody row pitched in C, the notes of the lower full octave of the instrument's range are assigned to four buttons as follows: Note: the first button in the example above, numbered 1, is likely to be the 3rd or 4th button in a row on an instrument.
Another feature designed to increase the flexibility of fourth-apart systems is the inclusion of notes that lie beyond the diatonic scales of each row, or "accidentals".
These notes are most often operated by the buttons at the top of the keyboard (that is, closest to the player's chin), below the lowest notes of the scale.
Since there are seven notes in the diatonic scale, and since each button produces two notes, the note pairings on the buttons change in each octave.
In the second full octave of the instrument’s range, E is paired with D (instead of with F in the first octave), and so on.
This configuration makes all the notes of the chromatic scale available.
As a result, such instruments could strictly be termed chromatic (rather than diatonic) instruments.
A melodeon or diatonic button accordion is a member of the free-reed aerophone family of musical instruments.
It is a type of button accordion on which the melody-side keyboard contains one or more rows of buttons, with each row producing the notes of a single diatonic scale.
Commonly used in continental Europe are two-row systems in G/C and C/F and three-row systems in G/C/F, but many other permutations exist.