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:

In the members of the violin family; In the members of the viola da gamba family; In some archtop guitars;

and in many other string instruments.

According to the A Dictionary of Music and Musicians by George Grove:David, Paul. "Bass-bar", A Dictionary of Music and Musicians. George Grove, ed.

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