The
banjo is a distinctly American instrument, although its origins can
be traced to Africa. Much like jazz music, the banjo was developed by
African slaves that had been brought to this country by Europeans during
the colonial period. The instrument, as we know it today, was based
on several different string instruments common to parts of the African
continent. The earliest banjos were made from a hollowed gourd, and
were thus called “gourd banjos”.
A banjo is constructed from many different components. The main structural
piece is called the “rim”. While they can be made from a
variety of woods, most of the best instruments have a rim that is made
from 3-ply maple. Around the rim sits the tone ring, which is essentially
the heart of the instrument. The tone ring can be made from wood, although
cast bronze is most often used on the best banjos. The combination of
the rim and the tone ring is often referred to as the “pot”.
The head (traditionally made from calf skin, but Mylar is usually used
today) is stretched over the tone ring much like a drum head. The tone
ring / head configuration can have a dramatic impact on the overall
sound of the instrument, with variations in this combination causing
variations in sound. The resonator is located on the back of the rim,
opposite the head. The resonator acts as a sort of amplifier, essentially
taking the sound waves created by the pot assembly and bouncing them
outward.
Connecting all these components is the flange. The banjo flange is
used to do several things. First, it is used to pull the tone ring down
firmly on the rim, creating the pot. Secondly, it is what the resonator
attaches too. And finally, it is used as an anchor point for the hoop,
which is used to pull the head down tightly over the pot.
The neck of the banjo is connected to the pot/resonator assembly through
the use of coordinator rods. These rods go through the center of the
pot assembly, with one end connecting to the neck and the other end
to the opposite side of the ring. In less expensive models, a single
wooden dowel is often used instead of the coordinator rods. Strings
are attached to the instrument through the use of the tailpiece and
the tuners. The tailpiece is attached at the bottom of the pot assembly,
and the strings are first run through this piece. At the top of the
neck, the strings are wound around the tuners, which are used to tighten
and/or loosen each string until it is in tune when plucked.
When all of these components work in harmony, they have the result
of producing the distinctive sound that is unique to the banjo. Whether
it’s a five-string bluegrass model, a four-string tenor version,
or any other variation of the instrument, the basic parts and construction
techniques are basically the same. However, small variations in many
of these components can be used to “tweak” the sound to
personal preferences.