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Three are "guitar not guitar" instruments
The six-string alto guitar or G Guitar or Terz guitar is a smaller version of the classical guitar, designed to be fitted with lighter strings and tuned a perfect fifth higher, to B-E-A-D-F♯/G♭-B.

Mauro Giuliani 和 Caspar Joseph Mertz 为 terz 吉他撰写了大量文章,作为主要(标准)吉他的补充。 terz 可接受的替代拼写包括 tierce、third 和 tertz。Terz guitar (Terz meaning third) refers to either a small sized classical guitar or to the practice of tuning a standard guitar a minor third higher than standard guitar tuning (as though a capo were on the third fret of the guitar). The scale length is generally 530 mm (20.8 inches), though sometimes as long as 560 mm (22 inches). Mauro Giuliani and Caspar Joseph Mertz wrote extensively for the terz guitar as a complement to the prime (standard) guitar. Acceptable alternate spellings for terz include tierce, third, and tertz.

Strings makers now produce strings that allow terz guitar tuning on standard scale length guitars at normal string tension.At the 2018 NAMM Show, Reverend Guitars launched an electric Terz guitar in production along with Billy Corgan.

The armónico, also known as trilina, is a guitar-like instrument from Cuba. It is a hybrid between the Spanish guitar and the Cuban tres. The armónico has seven strings: five single strings, plus one pair of strings tuned in unison. The armónico was invented by Cuban trova musician Compay Segundo, who loved the instrument as it allowed him to exploit the possibilities of both the guitar and the tres.

Counting from the lowest-pitched, the first three strings, E, A and D, are tuned an octave higher than the equivalent strings on a guitar with standard tuning. The fourth string, G, is doubled as well as also being an octave higher than on a guitar. The remaining two, B and E, are at the same pitch as a standard guitar. Therefore, the bottom E string is only one octave lower than the top E string on the armónico, instead of two octaves lower on the guitar.

Banjo guitar or banjitar or ganjo (Australia) is a six-string banjo tuned in the standard tuning of a six-string guitar (E2-A2-D3-G3-B3-E4 from lowest to highest strings). It differs from the standard five-string banjo, which features a short drone string that ends three-quarters of the way up the neck an the low side of the fretboard but is tuned highest of the strings in re-entrant tuning.

The first versions of six-string banjos were introduced in the late 19th century though did not gain popularity. The concept was reintroduced in the latter part of the 20th century with modern guitar-like tuning, allowing guitarists to play with a banjo sound without having to learn all new fingerings.
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