There are two copyrights: the song itself, and the recording of the song.
Yes you can use a protected logo or slogan as a theme (with permission) but it has nothing to do with copyright.Names, titles, logos, slogans, and common words/phrases are not eligible for copyright protection. They are usually registered and protected as trademarks.
Yes; it will be protected for 70 years after the death of the composer, who is still quite alive.
There are a number of works by this title; with the exception of the 1922 Lon Cheney movie, the themes for all are still protected by copyright.
Provided that all necessary documentation was filed, yes the Munsters theme would be protected by copyright until January 1, 2012 (70 years past the death of the composer, Jack Marshall)
Yes, the Charlie Brown theme music, "Linus and Lucy" composed by Vince Guaraldi, is not in the public domain. It is protected by copyright.
The 1896 tone poem Also sprach Zarathustra is in the public domain, but certain performances and recordings of it would still be protected.
Generally, yes.
Songs of Universal.
You may want to avoid using the trademarked name Jeopardy, or the copyright-protected theme music, but the idea of giving answers and asking for questions would not be protected, and using the same or similar scoring system should be fine.
Songs of Universal.
EMI Feist.
Next Decade Entertainment.