For me, how much I enjoyed the series has a lot to do with what I think of the music. The Hitchhiker's theme brings a big smile to my face . . . but so does the little set of chimes they use to announce a BBC production, just because I know that anything I watch after it (Dr. Who, Red Dwarf, etc.) is gonna be cool.

Star Wars music is . . . just iconic. I remember a story about a role-playing group. The GM (or DM, or Storyteller; I don't remember the system) wanted to introduce the story arc's big villain in a memorable way, so right after he said, "Well, you're in what looks like a throne room," he picked up the remote for his radio, hit a button--and the Imperial March comes on the speakers. Well, the players didn't even wait for the rest of the flavor text. They began shouting over eachother in an attempt to get their actions on record first: "I run like a little girl!" "I run like a faster little girl!" etc.

You don't even have to know Star Wars to know that music means Bad News in a big way.

Izunya

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Mal: Define "interesting!"
Wash: Oh God, oh God, we're all going to die?

- from Serenity