7-string acoustic guitars
prices on 1 model— most models from this category are the so-called "Russian" seven-string guitars (another name is "gypsy"). They differ from the popular six-strings not only in the number of strings, but also in the tuning — DGBDGBD. As for the sound, it is generally similar, although professional musicians and musicologists consider the seven-string guitar to be a more “smooth” and richer instrument in terms of sound. Such guitars were popular mainly until the end of the 20th century — in particular, it was seven strings that were used by such famous bards as Vladimir Vysotsky and Bulat Okudzhava. However, nowadays, this variety has fallen out of mass use.
Another type of seven-string guitar is the "Brazilian". It uses the BEADGBE tuning — that is, in fact, the standard six-string tuning with an additional bass string in tone B (electric guitars with this number of strings are also standard tuned).