What is the best tv theme song of all time?

Gilligan's Island or The Brady Bunch...tells you everything you need to know before starting the episode.

Van Der Valk - Main Theme
https://www.youtube.com/watch?v=OV8t3jA-krc

Monty Python's Flying Circus - Main Theme
https://www.youtube.com/watch?v=7QfqJwkuCTw

Reilly Ace of Spies - Main Theme
https://www.youtube.com/watch?v=qLb6tdz73oA

Inspector Morse - Main Theme
https://www.youtube.com/watch?v=u20sVtCxf_8

Foyle's War - Main Theme
https://www.youtube.com/watch?v=Uip0rLHp9hM

Battlestar Galactica (2003-09) - The Shape of Things to Come
https://www.youtube.com/watch?v=x8zsE5zdlsQ

The Tudors - Opening credits season one
https://www.youtube.com/watch?v=V7VS1026K6k

Carnival Row - Opening credits season one
https://www.youtube.com/watch?v=aOvzBh73ND8

I like the theme from Hawaii Five O - still going strong.

I always thought Dr. Who had a cool trippy theme, but it's got to go to The Greatest American Hero.

The Equalizer
https://www.youtube.com/watch?v=JAei6YFGlDQ

Miami Vice Theme
https://www.youtube.com/watch?v=dEjXPY9jOx8

A-Team
https://www.youtube.com/watch?v=_MVonyVSQoM

Ulysses 31
https://www.youtube.com/watch?v=OZ4c1X5ene8

I hate the show, but I dig the MASH theme.
So timeless and memorable.

Beverly Hills 90210 is one of my favourites. Buffy is good as well.

Peter Gunn