"Can't Hold Us" by Macklemore and Ryan Lewis - one we discussed a lot last summer, this should be no surprise.
"Clarity" by Zedd feat. Foxes - I think this could easily be parodied, and Al's never spoofed an electro-house song like this. It would be nice in the fourth or fifth parody spot. I still think he could make it the last parody on possibly-his-last-full-album and call it "Parody," making it about himself, but maybe not.

"Wake Me Up" by Avicii feat. Aloe Blacc - similarly electro-produced. Plus, nobody answered me when I asked about the parody-worthiness of Aloe Blacc! None of you can see a parody of this or "The Man"?
"Radioactive" by Imagine Dragons
"Treasure" by Bruno Mars - I know he was technically part of a parodied song on Alpocalypse, but I really feel he'll be represented somehow on Album 14. Polka instead, maybe.
"Holy Grail" by Jay-Z feat. Justin Timberlake
"Mirrors" by Justin Timberlake - both of these because he's gotta do JT at some point, honestly
And yeah, I'll throw "Come & Get It" by Selena Gomez and "Heart Attack" by Demi Lovato on here too
NO "Blurred Lines," Miley Cyrus, PSY, Bieber, One Direction or "Cups," because all of them have some amount of novelty already attached to them. (Except One DIrection, maybe, at this point, deserves it.) I'm not feeling "Cruise" by Florida Georgia Line or "Get Lucky" by Daft Punk either because they might be too difficult to get a good parody idea out of - better suited for the polka.