What's the original (actual) title of the LITB theme? It's something to do with the circus or music or something; I have seen it but have forgotten.

I believe it is called the toy parade.

"The Toy Parade" - Lyrics and music: Dave Kahn, Melvyn Leonard, Mort Greene.

Lyrics:

Hey! here they come with a rum-tee tum
they're having a toy parade
A tin gi-raffe with a life and drum is leading the kew-pie pa-rade
A ging-ham cat in a sold-ier's hat is waving a Chi-nese fan
A plas-tic clown in a wedd-ing gown is dancing with Rag-ge-dy Ann

Fee fie fi-dle dee dee they're crossing the living room floor
Fee fie fid-dle dee dee they're up to the dining room door
They call a halt for a choc'late malt or cookies and lem-on-ade
then off they go with a ho ho ho right back to their toy bri-gade.