I don’t mean theme song, I mean music. Although I suppose we can count actual “songs” too. It’s just that my two favorites aren’t songs, just music:
Doctor Who
Angel (Has a cello ever been used in TV theme music before?)
Andy Grifith and Buffy the Vampire Slayer have pretty cool tunes too.
If I had to pick an actual song, I’d go with the one from Cheers or Highlander the series.
Whatever was on last night (I wasn’t watching) – a show about forensics, tracking bad guys – and the song was Who’s classic “Who Are You?”. Appropriate, if nothing else.