From the smash hit
(well, in my mind anyway) US television series 3-2-1 Contact!
from the Children's Television Workshop and PBS
from 1980-1992. Performed by Al Dana, Hank Martin, Tish Rabe, and Ruth Sherman.
I grew up with this show, boy does it take me back. Notice that ism's writeup under 3-2-1 Contact is incorrect, at least according to the .mp3 I just listened to (which sure sounds authentic). Notice, also, that this song conveniently explains both when and why Everything happens. Coincidence? I think not.
... is the secret,
... is the moment,
when everything happens,
...is the answer,
...is the reason,
that everything happens,
Let's make contact! <boing>