Resonator guitars were originally designed to be louder than conventional acoustic guitars which were overwhelmed by horns and percussion instruments in dance orchestras.
Valco produced a large volume and variety of fretted instruments under many names, with National as their premium brand. By the early 1960s, Valco was again producing resonator guitars for mail order under the National brand name. These instruments had biscuit resonators and bodies of wood and fiberglass.
Some square neck tunings are not recommended for round neck resonator guitars, owing to the high string tension required, which in turn requires the stronger square neck. Slack-key guitar tunings are most suitable for bottleneck playing, and conventional E-A-D-G-B-E guitar tuning is also popular.
Unlike country and bluegrass players, most blues players play the resonator guitar in the standard guitar position, with the strings facing away from the player. Many use slides or bottlenecks.
For the same reason street musicians like Arvella Gray used resonator guitars while busking, e.g. on Chicago's Maxwell Street. The instrument is still used by some blues players, notably Taj Mahal, Eric Sardinas,Alvin Hart and Eric Erkkinen.
Metal bodies may be brass, aluminum or steel. Fiberglass has also been used as a body material, and a marble bodied resonator guitar is commercially available. Both metal and wooden bodies are often painted, or wooden bodies may be stained or lacquered, metal bodies may be plated or plain.
Source: Wikipedia > Resonator Guitar
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