1. A customizable stringed musical instrument comprising: a plurality of insertable neck elements, wherein each neck element of said plurality of insertable neck elements comprise at least one vibrating string, and wherein each of said plurality of insertable neck elements is adapted to change the vibrating length of said at least one vibrating string; a string instrument body comprising a designated area for accepting one of said plurality of insertable neck elements, wherein each of said plurality of insertable neck elements generate electrical signals in response to user operation; and an instrument interface coupled with said one of said plurality of insertable neck elements, said instrument interface adapted to transmit interface signals to an external system, wherein said interface signals are generated in response to said electrical signals generated by said one of said plurality of insertable neck elements.