Here are the lyrics to the theme (yes there are lyrics) - Also, if I can find it again, there is an actual recording from Nichelle Nichols (Uhura) singing it
Beyond the rim of the starlight,
my love is wandering 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.
I learned the lyrics back in the 70s from my John Brimhall's Easy Popular Piano Pieces songbook. Still have the book. Still have the lyrics memorized. 😂
Here it is - Star Trek theme sung by Nichelle Nichols (Uhura)
https://www.youtube.com/watch?v=Nq8lLz3ivVk