The song is basically the main notes from "Heart and Soul": Middle C, A, D, lower G. It sounds more like it if when you hit C, you hit the E and G above it in a chorde (and the same pattern with the other notes: A with C and E, D with F and A, and G with B and D). Tell me if that doesn't make sense, as I'm not the most musically inclined and it's been many a year since I took music lessons.
I could record it, but my piano is a bit out of tune.