I just heard Jack's first CBS show again today, and Phil mentions that they won't let him sing his song on this network. That leads me to a couple of questions.
This sounds like a real situation, but was it possibly just for a gag?
If real, did NBC own the song, or did CBS just not want it sung for some reason?
Was this "The Thing" or "That's what I like about the South?"
What other stipulations did CBS or NBC make on Jack?
(I remember all of the sticky legal problems when David Letterman switched networks and had to rename the show, etc...)