No, because the law isn't applied by robots.

That's actually the point of Lessig's lawsuit - that there neds to be a human in the loop when these notices are issued, because deciding if something is likely fair use or not isn't something you can do mechanically (at least with current technology).

... and then also actually critique it? Fair use involves more than just a declaration.

I could be wrong, but I believe you can only play sections of it at a time. I don't think you'd be allowed to play a whole song and just display words critiquing it.