2 points
Airwolf’s opening I’ve seen before; and the Dallas one is pretty great. Here are a couple I’ll throw in to the mix:
Rupert note the interesting time signatures
Gormenghast the first and second books are excellent. The third is… different…
The Prisoner possibly the greatest (and surely the longest!) opening
2 points
“The prisoner” is quite wild from a music perspective and way ahead of it’s time. Looks more like a 60s/70s series. Never saw it myself.
I guess it’s not so decade dependent, but more about someone caring enough to make a good intro song.
Here are more TV themes that you didn’t know you already knew:
Round the Twist (this is the Epitome of early 1990s)
