Thanks in advance to anyone who can answer my question, I'm a HUGE fan of ELO, Classical Music, Rock, and Electronica and made a talk box for myself - but I can't get the sound I want to mimic ELO.

In the songs Mr. Blue Sky and Confusion you hear the (what sounds to be pianist) going "Mister blue skyyyy" when the letters come on on the old video version, and when Jeff says "Confusion!" In the current video for Mr. Blue Sky, you can see the Pianist saying it but I can't tell what he is using equipment wise - does anyone know?