All right, Peter Gunn is the one. But I can still mention a few that no one else seems to have remembered.
“T.H.E. Cat”. Strong horns, then the flute, going back to the horns.
“It Takes a Thief”, second season. The violins going up into the brass theme. Dave Grusin, a famous name in jazz circles.
“Search”, an old one. Dominic Frontiere. They would hit you with those brass pulses in the teaser, then fade into the melody.
“Babylon 5”, fifth season. Yes, I know no one besides me likes the thing, but I can forget the music (not the words) of the other four. That martial theme sticks with me.
Sorry again, but I like the “Crusade” theme. Call me tasteless. The cold, metallic tones and rhythms reminded me of Galen.
One thing about Irwin Allen: he may have done lousy science fiction, but the themes for his shows were great. Someone has already mentioned “Lost In Space”. Add “Voyage to the Bottom of the Sea” (the sonar pulse was a great draw into the rest of the show), “The Time Tunnel” (the horn riff, the loud base horn rumble, and the flute over all — it got me, as well as the “tick, tick, tick” at the beginning), and “Land of the Giants” (horns again, all low to represent the huge scale of things). Allen had a trick of tying the music of the themes to the show better than anyone I can think of, except perhaps:
Both of the Whedon shows. Really. Someone has already mentioned the theme to “Angel” (the low chello, jazzing it up, the bell tolling at the end), and Buffy is just right (the organ at the beginning, the jazzy lift that just shouts teenagers, the great guitar riffs at the end).
Sorry, everyone, but I really like “NYPD Blue” as well. The incredible percussion at the start, fading into the peaceful electronic chords, puncutated with the percussion at the end. Great stuff.
One more. No one has mentioned “Due South”. Not only was the theme great, but it has one of the best soundtracks ever. “Victoria’s Theme” is now my audio representation of unrequited love.
I could go on, but that’s enough. I think I live in my head sometimes.