Wonder what service they use. Most places I wind up in seem to either use Mood (Muzak) or SiriusXM. Both have a wider variety (Mood has 15 Christmas channels) but as you might guess, what WLIT is doing is playing the familiar Christmas songs people know. Overnights I believe they use a Premium Choice Christmas format (Or they did in previous years) This year the music is different from WRIT Milwaukee, which had been using the same log as WLIT during some shifts.
Side note I heard Andy Williams on B96 a couple times.