There's big bucks to be made in music and soundtracks, and for good reason; music can form an integral part of our relationship with anything that we watch, and impact a show's success and its ability to be remembered.
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What TV theme song do you love to have stuck in your head?
Although not necessarily my favourite theme tune, I think one of the best theme tunes that fits the nature of the program, is Dido's 'Here With Me' for Roswell. The show is about aliens on earth trying to find out who they are, where they belong, trying to fit in, and hiding from those who want to kill them. The song goes 'Oh I am what I am, I'll do what I want. but I can't hide, I can't be, until you're resting here with me'. The two were practically made for one another.
My favourite is probably Doctor Who (in all its variations). I also love the themes to Farscape (it sounds really alien, fits the show so well), The X Files (so evocative!) and Battlestar Gallactica (drums!). For singing along badly I like Firefly, M*A*S*H, Veronica Mars' "We Used To Be Friends and Scrubs' "I'm No Superman".
Reading through some of the answers here, I now have about 5 TV themes in my head: MASH, The Brady Bunch, Cheers, throw in a little Gilligan's Island for good measure.
I like the theme from Mad Men and The Wire. I especially like the way they re-recorded The Wire theme each year. Oh, and if you like New Orleans jazz, nothing beats the theme from Treme.
The theme of 'Offspring' is great. The theme to 'The Grahame Norton Show', is instantly recognisable. But the 'Friends' theme, is the one that really gets stuck in your head! Now you've put up 'The Monkees' picture, it's theme is now running through my head. Sesame St's is memorable, as is 'Playschool's'. Friend's theme to be hands down, the one everyone would sing the instant a reruncomes on. Gilligan's island would also be instantly recognisable to people of a certain age.