After he officially signed with ESPN yesterday, Buck was seen on Fox later that night being unmasked as the Ram on "The Masked Singer":
He sang Cheap Trick's "I Want You to Want Me," John Denver's "Take Me Home (Country Roads)" and Foo Fighters' "Learn to Fly" (you know, the video parodying the old Mentos commercials) over his two weeks on the show. He was better than expected as a singer.
Meanwhile, we've yet to see Rudy Giuliani. The hype was that he was revealed at the first taping session, but this was episode 2 last night. We assume that Fox will not be subtle about promoing his unmasking, as the show itself is as subtle as a flying mallet.