How was traditional appalachian music passed down from generation to generation?

a. it was learned from memory and passed down orally.

b. it was recorded in books of music.

c. it was written down in the form of sheet music.

d. it was taught in traditional appalachian music schools.

Using the correct order of operations, what does this formula equal? =(4-2)*6/2.

This is just a little thing i just did for fun! hope you enjoy! a: ~what would you first grand if your house was onfire? b: ~what do you first notice on a person? c: ~ what are some challenges you think the next generation will face? d: ~what is the most embarrassing moment in life? e: ~what is your favorite artists? //music//f: ~what are some bad habits you can't stop doing? , but you know you need to stop on them.i really hope you had fun doing this, or not doesn't matter, but if you want more from me contact me! bye now//i can't wait to see some results//ㅋㅋㅋㅋㅋ나를 따라라! ^^(i'm going to put this under arts, even though it's not, so yeah)

What does bts stand for? what is the importance of bts? who first started it?