I've looked at several zongs over the last few days where the post has been completely empty.
There's a title. And that's it. Or, in a couple of cases, a title and a basic description of the genre of the song (e.g. "This one's a slow blues.") But there's nothing for us commenters to get a grip on to provide feedback with. No lyrics, no demo, no link to Bandcamp, nothing.
If you're doing this, I believe you're missing the point of the challenge. We help each other become better songwriters by reading or listening to each other's work and leaving comments or suggestions on a track. I know from personal experience just how powerful comments from others can be as a tool for improving your endeavours. We can't do that from just a title.
We want to hear your stuff. We want to read your lyrics. PLEASE give us a chance to do so!