I don't know about favorite, but I like the original Battlestar Galactica theme.
I have that on a 33LP album. It was released to the radio media when I was a DJ - and I snagged it.
I don't know that I have a favorite... I like lots of the older theme songs... one that comes to mind...
"Now let me tell you a story 'bout a man named Jed.
Poor mountaineer, barely kep' his family fed.
Then one day, he was shootin at some food -
and up through the ground came a bubblin' crude.
Oil that is.
Texas - T."
...
You know the rest. Now. That'll be playing through your mind all day.
*wide grin*
Regards,
Jim TX