In a string instrument, the bass bar is a brace running from the foot of the neck to a position under the bridge, which bears much of the tension of the strings. Bass bars are used: A string instrument (or stringed instrument) is a musical instrument that produces sound by means of vibrating strings. ... Look up brace in Wiktionary, the free dictionary. ... To meet Wikipedias quality standards, this article or section may require cleanup. ... The neck is the part of the body on many limbed vertebrates that distinguishes the head from the torso or trunk. ... A log bridge A bridge is a structure built to span a gorge, valley, road, railroad track, river, body of water, or any other physical obstacle. ... Look up String in Wiktionary, the free dictionary. ...

• In all members of the violin family;

• In some arch top guitars;

and in many other string instruments. The violin is a bowed stringed musical instrument that has four strings tuned a perfect fifth apart, the lowest being the G just below middle C. It is the smallest and highest-tuned member of the violin family of string instruments, which also includes the viola and cello. ... Archtop guitars are steel-stringed acoustic guitars with a distinctive arched belly and a sound particularly suited to blues guitar and jazz. ...

According to the 1880 Grove's:

BASS-BAR, an oblong piece of wood, fixed lengthwise inside the belly of the various instruments belonging to the violin-tribe, running in the same direction with the strings, below the G string, and acting as a beam or girder to strengthen the belly against the pressure of the left foot of the bridge, as the sound-post does against that of the right foot. It is the only essential part of the instrument which, owing to the gradual elevation of the pitch, has had to undergo an alteration since Stradivari's time. Tartini states, in the year 1734, that the tension of the strings on a violin was equal to a weight of 63 lbs., while now-a-days it is calculated at more than 80 lbs. This enormous increase in pressure requires for the belly a proportionate addition of bearing-power, and this could only be given by strengthening the bass-bar, which has been done by giving it a slight additional depth at the centre, and adding considerably to its length. In consequence of this we hardly ever find in an old instrument the original bass-bar of the maker, just as rarely as the original sound-post or bridge, all of which however can be made as well by any experienced living violin-maker as by the original Stadiveri or Amati. P.D. The Honourable Paul David (December 25, 1919 - April 5, 1999) was a Canadian cardiologist, founder of the Montreal Heart Institute, and Senator. ...