Who remembers the theme from LOVE AMERICAN STYLE? Now THAT was a funny show!
Ah yes, the show that actually led to Happy Days.
A couple of other shows that have yet to be mentioned, although I don't think were as great as many already listed here, but still good, were The andy Griffith Show (which actually does have words), the instrumental to Mork and Mindy, and the intro to Laverne and Shirley.
As for Gilligan's Island, how many people can do the closing song to the show?
Now this is the tale of our castaways,
There here for a long, long time
They'll have to make the best of things,
It's an uphill climb.
The first mate and his skipper too,
will do their very best,
to make the others comfortable
in a tropic island nest.
No phone, no motor car, not a single luxury,
Like Robinson Curosoe, as primitive as can be.
So join us here each week my friends,
You're sure to get a smile,
From seven stranded castaways,
Here on Gilligan's Isle.