I think I mentioned I'm part of a collaboration in this challenge. The original song we were going to use has turned out to be too long, so we've written a new one which is now in production. It's getting close to done but, because of circumstances sort of beyond our control, it will likely be at least another two weeks before it is done. So it's coming.
I suspect, with a deadline so far in the future, some people are procrastinating due to the illusion there is "plenty of time"!