Hallo guitar fans. Most of you are already familiar with a term extended range guitar. Most people would define extended range guitar as any guitar that has broader range of a frequency spectrum, or it's tuned higher and/or lower than the usual standard low E to high E tuning. What is standard today? For example, Russians have 7 string classical guitar since 18th century. Some of these guitars had up to 11 or 12 strings, with 7 fretted strings and 4-5 unfretted bass strings. They considered 7 string standard by their criteria back in the day...