What is the difference between a seven string guitar and a normal guitar?

The main difference between a seven-string guitar and a standard six-string guitar obviously lies in the number of strings and how that affects the instrument's range and capabilities. A few of the key distinctions are mentioned below:

Number of Strings:

 

Standard Guitar (Six-String): A standard guitar typically has six strings tuned EADGBE, from the lowest-pitched string (6th string) to the highest-pitched string (1st string).
Seven-String Guitar: As the name suggests, a seven-string guitar has an additional low-pitched string, usually tuned to a B note, extending the range of the instrument.

Extended Range:

With the addition of a seventh string on a seven-string guitar, players have access to lower notes than on a standard guitar. This expanded range allows for deeper bass notes and additional chord voicings, making the instrument suitable for a wider variety of musical styles, including metal, jazz, and fusion.

String Tension and Neck Width:

 

Due to the extra string, the neck of a seven-string guitar is slightly wider than that of a standard guitar to accommodate the additional string. This can affect the feel of the instrument, particularly for players with smaller hands.
Additionally, the tension on the strings may be adjusted to maintain balance across all strings and ensure proper intonation.

Playing Technique:

 

Playing a seven-string guitar requires some adjustment in technique compared to a standard guitar, particularly in terms of fretting chords and navigating the extended range of the instrument.
Players may need to develop new fingerings and chord shapes to take full advantage of the added string, especially when incorporating it into lead lines and solos.

Musical Applications:

 

Seven-string guitars are popular in genres such as metal, progressive rock, and jazz, where the extended range and lower tunings offer sonic versatility and the ability to play complex arrangements.
However, they can be used in any musical context where the extended range is desired, offering new creative possibilities for composers and performers alike.

In summary, while both standard six-string guitars and seven-string guitars share many similarities, such as tuning and general construction, the addition of an extra string on a seven-string guitar significantly expands its tonal range and musical capabilities, making it a distinct instrument suited to specific genres and playing styles.