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Banjo
Bluegrass as a style developed during the mid-1940s. Because of war rationing, recording was limited during that time, and it would be most accurate to say that bluegrass was played some time after World War II, but no earlier.
As with any musical genre, no one person can claim to have "invented" it. Rather, bluegrass is an amalgam of old-time music, country, ragtime and jazz. Nevertheless, bluegrass's beginnings can be traced to one band. Today Bill Monroe is referred to as the "founding father" of bluegrass music; the bluegrass style was named for his band, the Blue Grass Boys, formed in 1939.
B. Elvis Presley
Earl Scruggs and Lester Flatt
Willie Nelson
Appalachian
Texas.
The acoustic guitar became more popular in early 20th century America, and and guitar-makers began building louder guitars.
All of the above -Apex
Jamming is a radio transmission deliberately sent out to disrupt the enemy's communications.
bela fleck-banjo
jerry douglas-dobro
clarence white-guitar
alison krauss-fiddle
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all of the above (apex)