Trek Fan Soundtrack

Being the absolute music nut and musician I am this question tends to hop around my head a lot. A hell of a lot.

'What piece of music do you think of for...?'

I wanna know what songs you think of when you think of Jim, or Bones, or Spock, or Jim/Bones, Chekov, Reaper!Bones...anything really! Anything from the Trek universe. And I dont just mean like the actual movie soundtrack, thats given.

Any piece of music. Doesn't have to be lyrical really, even instrumental pieces can make you think of a certain fic or a certain piece of art, or a scenario that you have imagined.

General suggestions:

- Characters: Like Jim, Bones, Spock, Chekov, Sulu, Uhura, Scotty...on and on. What song do you hear as their theme?

- Pairings: eg. Jim/Bones, Jim/Spock, Spock/Bones, Bones/Chekov, Sulu/Chekov, Spock/Uhura...what do you hear when you read them?

- Fan related: Songs that make you think of a particular fandom fic or artwork?

- Doom Trek: Things that make you think of Reaper!Bones and everything related to that style 'verse.

So? I'm curious guys :)