The link to the tune I provided above is dead for now. Witness.

Too bad. There were a couple other tunes and audios related to the Captain there. Maybe one of them was the one you were thinking of, Mark...

To answer your other question, I found out the name of the Captain's theme was "Puffin' Billy" a couple of years ago when I was doing a search on television theme songs. That was one of the first I found; it was on a CD of TV theme music I got from my library. Really brought back the memories.

"Don't fall for it Captain! Mr. Moose is trying to trick you! Here come the ping pong balls!!!"

As a kid, I always wondered who was stuck picking them all up. I'd always imagined Captain Kangaroo having to stoop over and gather them all up himself every day. Job security, I guess.