Cumbush
Cumbush is a type of stringed instrument that was invented by Zeynel Abidin Cumbush in the beginning of 20th Century. The neck part of the Cumbush can be separated from the body part of the instrument, from the the point where they join together. By doing this, we can change the strings only and convert it into a mandolin, a guitar and many other instruments. Overall, the structure is similar to a banjo and an oud.