It sounds like one girl and autotune, mostly, but since I have seen some TM videos of late, it is actually two girls and a guy. Not to disparage the talent and work of people making these, it is what programmers want, or maybe they are free. The sound is thin and they must not want many male voices. I can’t tell if they are using the 5 note WLS logo melody note for note… (wonder who owns it if anyone?)
At least they are using jingles, prior to this it was liners of people in the street shouting things about the station.