String band
A string band is an old-time music or jazz ensemble made up mainly or solely of string instruments. String bands were popular in the 1920s and 1930s, and are among the forerunners of modern country music and bluegrass.
String bands in old-time music
During the 19th and early 20th centuries, other stringed instruments began to be added to the fiddle-banjo duo that was essential to dance music of the early 19th century United States. These other instruments included the guitar, mandolin, and double bass (or washtub bass), which provided chordal and bass line accompaniment (or occasionally melody also). Such an assemblage, of whatever instrumentation, became known simply as a "string band."
In the 1870s African-American dance houses of Cincinnati had musicians who played violin, banjo, and bass fiddle. East of the Mississippi, the genre gave way to country music in the 1930s and bluegrass music in the 1940s. During the same period, west of the Mississippi, Western musicians retained the acoustic style of the bands while the big Western dance bands amplified their strings.