What TV series has the best intro song or sequence? What TV series have the worst intro song or sequence?

Absolutely top-tier opening theme, certainly in contention for best. Definitely all-time best soundtrack, taken as a whole, no contest.

I was afraid I was gonna have to say Tank!, but ya beat me to it, ya beautiful bastard.

Worst is MASH, imho. The intro music is on par with a dose of phenobarbital.

God dammit.