LaTeX formatting issues

I am about to submit an article for review, and had to format in a special way. Here is a quick summary of what I did:

No paragraph indents:

but a single line between:
Left text justification:
 \begin{flushleft} ...  \end{flushleft}
Double spacing:


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Alexander Refsum Jensenius is a music researcher and research musician living in Oslo, Norway.