I'll second Andy Griffith but will throw these in as contenders:
Mission Impossible
Chico and the Man
Starsky and Hutch
WKRP
LA Law
Hill Street Blues
Peter Gunn (for SpyHunter fans)
M*A*S*H
Wild Wild West
S.W.A.T.
Johnny Quest
Fat Albert
HR Pufnstuff
The Banana Splits

Ahh a mispent youth. I think I'll go get a bowl of Count Chocula and hum along.

How is that I can't remember anything from my calculus classes but I've this crud still stuck in my head?

http://www.tvland.com/theme_songs/