Editing Seven-string guitar (section)

{{Short description|Fretted string instrument}}
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[[File:Seven-string-guitar.jpg|thumb|A Brazilian seven-string guitar]]
[[File:Soulezza 7 String Guitar.jpg|thumb|Soulezza 7 String Guitar]]
The '''seven-string guitar''' adds one additional string to the more common [[six-string guitar]], commonly used to extend the bass range (usually a low B) or also to extend the treble range.

The additional string is added in one of two different ways: by increasing the width of the fingerboard such that the additional string may be fretted by the left hand; or, by leaving the fingerboard unchanged and adding a "floating" bass string.  In the latter case, the extra bass string lies next to the existing bass strings, but free of the fingerboard in similar fashion as the [[archlute]] and [[theorbo]]. Such unfrettable bass strings were historically known as diapasons or bourdons.

Some types of seven-string guitars are specific to certain cultures such as the [[Russian guitar|Russian]], [[Guitarra séptima|Mexican]], and Brazilian guitars.