The first song that popped in my head was "Cssper the friendly ghost/friendliest ghost you know/grown-ups might look at him in fright/but children all love him so".

This song might be on YouTube, but the video clip that I thought would be that song turned out to be catchy square dance style song that introduced Casper, Witch Wendy, and other characters from that American cartoon show.

Here's the clip's summary statement:

"The New Casper Cartoon Show debuted on ABC in 1963, and stayed on Saturday mornings until 1969. Here's the opening title sequence, which was heavily influenced by the folk music show "Hootenanny"

http://www.youtube.com/watch?v=q5YYbsoiNGI