The opening theme for the Original Star Trek series is still my all time favorite, and I can remember it from when the show was on the first time. After that, the opening theme to Deep Space Nine, and the Stars War Theme by Meco.
There is also the music to the movie, Forbidden Planet. Just determined that is available from the iTunes store.
There are actually lyrics for the star trek theme...
http://www.youtube.com/watch?v=hZZcNdGyvVc (disco-ish version 1)
http://www.youtube.com/watch?v=wrckNMfQj6c (Nichelle Nichols sings varient of lyrics)
http://www.youtube.com/watch?v=_v1J-kGxXds (disco-ish version 2)
Beyond
The rim of the star-light
My love
Is wand'ring in star-flight
I know
He'll find in star-clustered reaches
Love,
Strange love a star woman teaches.
I know
His journey ends never
His star trek
Will go on forever.
But tell him
While he wanders his starry sea
Remember, remember me.
Two great names to look for on youtube...
Alexander Courage
Dominic Frontiere
listed in no particular order
but at the end of the day... I gotta put my money on UFO... UFO...
http://www.youtube.com/watch?v=5pRmy2NktRc
of course, for a pure injection of nostalgia...
Fireball XL-5