Yeah, this is what would make it interesting to me.
Use the lyrics only is the main rule. No chords/structure.

As a side note, I don't think we should be limited to using BiaB for everything.
If using RB would be an option, I'd be more even enticed.
Maybe the rule 'you have to use PGMusic products in the project' as a requirement (?)
/Or some part(s) of the project need to be generated.

Complex part: Selecting a set of lyrics that could fit in many different genres.
This would expand the possibilities and maybe even make it fun to try/submit a few different styles/genres.

Once defined, I think this could be a hugely successful idea.
And just as huge of an opportunity for PGMusic. <wink>

I do not work here, but the benefits are still awesome
Make your sound your own!