Please give us the song title and a link to the song lyrics and tell us exactly what you need. Are you asking about two different lines? If so, you'll need a thread for each question. Or is your #2 an interpretation of #1? Thank you.
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(Ella fitzgerald, "all over nothig at all")
As I'm not english native speaker, I've some doubts about the meaning of the sentence "it's all over nothing at all" and I wanted to know if it means that
a) it's completely over (it's all over, there's nothing at all)
b) it's not completely over (nothing at all is over)
The "nothing at all" here means "nothing of any significance". The "over" is similar to "on the topic of" or "about". "All over nothing at all" means "This entire thing/incident was about nothing of any significance".
"All over nothing at all
You built me up to a waterfall"
We had an argument about something of no significance to the point that you made me cry.
As another example of "All over":
"They fought and broke up, all over the fact that she wouldn't get rid of her old boyfriend's picture."
Another example of "over" in this sense:
"They argued over how to spend the lottery winnings."