What is bass-bar?

A bass-bar is a wooden part that is found inside the body of a violin, viola, or cello. It is typically made of spruce, which is the same type of wood used for the instrument's soundboard. The bass-bar is placed on the inside of the soundboard, running parallel to one of the instrument's wooden strings. It is designed to enhance the lower notes of the instrument, giving them more volume and projection. The bass-bar is an essential part of the instrument's construction, and is carefully crafted to ensure that it is perfectly positioned and shaped to produce the desired sound.