To add to the topic. I think what was meant by "Complete" is from the listener's perspective- not the artist's (It's never truly complete is it?).
IE: The uploaded track does not cutoff midway through the song- with your added text saying that you are still working on it. 
faq wrote:
The submission should be over minute long, but this rule is flexible. Just be sure your composition is complete and not just a snippet or a work in progress.