The tempo for the music by Alexander Courage is "Bright Galactic Beguine." Words by (Oh, the shame) Gene Roddenberry.
Beyond the rim of the starlight,
My love is wand'ring in starflight.
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.
Try to get THAT out of your brain, Cuddles.