What's the name of that ''Spirit of '76'' music?

You know, the flute tune that you hear whenever you see the painting.

Yankee Doodle?

You’re probably thinking of The Girl I Left Behind Me . Here is a link to a page with a midi of the song and a little history.

That’s it! Thanks a bunch.

You mean this one? Enjoy!
The famous one, from 1875, hangs here, for all to see, free
“Marblehead Forever!”