Everybody knows that a fiddle and a viloin are the same basic instrument but what are the main differences in style, technique and set-up?

Where did the fiddle style of playing with the butt of the fiddle on the chest come from- the British Isles?

What is the difference between country and bluegrass style playing and Celtic and other folk styles- or are they similar?

What are the different choice of scales (pentatonic) with flat 3rds 7ths and 5ths?

What are the bowing differnces and use of slurs between bluegrass and classical?

How about tunings?

And drone strings?

Thanks,

Richie