Opening and ending titles of a TV series can be a little work of art, music-wise at least.
What are your faves?
One thing I've always liked about English detective series is the awesome music.
Midsomer Murders, for example:
http://www.youtube.com/watch?v=YTZK9FNgK74
One of the best opening sequences that there IMHO is - Poirot. A TV series opening sequence simply can't get much better than this, both in terms of music and the visuals. Stylish, classy, awesome (just like the series itself).
http://www.youtube.com/watch?v=Hmx6dQJf_rk
When I was a kid, I totally loved The Outer Limits series. The quality of individual episodes varied from totally brilliant to real real bad and boring, but I liked the show nonetheless. And the opening sequence was what I probably liked best.
http://www.youtube.com/watch?v=2I7vPbthvWo
I should add this is one of the few instances when I strongly prefer the dubbed version. The somewhat sensational tone in the English version sounds odd to me, as I was used to this:
http://www.youtube.com/watch?v=_4mERdJVcXA
And two masterpieces by Mark Snow...
My fave was Millennium - http://www.youtube.com/watch?v=T6dwMxDGoXk
...though most seem to prefer X-files: http://www.youtube.com/watch?v=OBmX28p-6eM
Twin Peaks - http://www.youtube.com/watch?v=X2lkvrMa27c
Dexter...:-)
http://www.youtube.com/watch?v=k7Eo6Omeqb8
EDIT: I'll just add some Chinese faves and that's it from me for now...:-)
When it comes to wuxia, nothing what I've heard so far has outdone this themesong in terms of drive and balls (well - with the possible exception of Hao han ge): Hao nan er - http://www.youtube.com/watch?v=eUu1ar0G9Mk
And The Qin Empire opening is awesome. Very goosebumpy. http://www.youtube.com/watch?v=9CPS-vMRSsw
Nostalgia factor is important here - this is one of those sotries I've grown up with...: Journey to the West - http://www.youtube.com/watch?v=QnR3bYpLb0A
I've written more than enough. There's still a lot more I'd like to mention, but it's your turn now...