My brain is completely blank.
Theme song?
What song title describes me?
My movie would be either Beauty and the Beast or Some Kind of Wonderful (I’m the Mary Stuart Masterson character).
But theme song???
If at first you don’t succeed, try try again….(Is that really a song?)
Tub Thumping comes close…..
I get knocked down, but I get up again….you’re never gonna keep me down…
That’s all I’ve got. What about you?
Molly's Musings/Kenzie's Korner 
I empathize with the difficulty of this particular blog prompt!
LOL….this was a tough one!
Tub thumping does really stick in your head once it gets started…like it just did.
Of course, after I read everyone else’s posts, LOTS of music ideas popped into my head….Bon Jovi’s It’s My Life, Journey’s Don’t Stop Believing, and the Beatles’ Paperback Writer….