Hello,

I think its a pretty known folk song in US:

I've been working on the railroad
All the live-long day.
I've been working on the railroad
Just to pass the time away.
Don't you hear the whistle blowing,
Rise up so early in the morn;
Don't you hear the captain shouting,
"Dinah, blow your horn!"
Dinah, won't you blow,
Dinah, won't you blow,
Dinah, won't you blow your horn?
Dinah, won't you blow,
Dinah, won't you blow,
Dinah, won't you blow your horn?
Someone's in the kitchen with Dinah
Someone's in the kitchen I know
Someone's in the kitchen with Dinah
Strummin' on the old banjo!
Singin' fee, fie, fiddly-i-o
Fee, fie, fiddly-i-o-o-o-o
Fee, fie, fiddly-i-o
Strummin' on the old banjo.


My questions are:
1. "Don't you hear the whistle blowing" - I think its about simple whistle in captain's hands, that talks about break during their workday, right?
2. "fee, fie, fiddly-i-o" is it an onomatopoeia of banjo, or these words have some meaning? Or both?