The person who started this is a scientist for her day job; she was compiling data. A friend of hers was writing a piece for a dissertation. You could have someone there working on chords and lyrics; singer-songwriters are among the group who want to do this.
Me, I wrote doggerel. Yep, that thing about dogs, appropriate for being written at the dog-friendly Lucky Lab pub. I published it in this here blog, then sent the link via Twitter to the ringleader. I wrote "proof of work" in that Tweet. There: words I otherwise wouldn't have written.
Again, nice idea. I also did it with soup, bread, and a nice cider getting me nicely buzzed. I can always be around more people when I go out to eat and drink, and doing so like this...it felt good.