Jeff Sanford's Cartoon Jazz Orchestra
Something I stumbled over, and I said I recognize that tune. Well, yeah, it was used in every Warner Brothers cartoon for the last thousand years. I also found it on lala.com, a site I had not come across before. Lala behaves kind of strangely. I first time I pulled it up, it played the whole tune. The next time it only gave me a 30 second clip. They want you to buy the tune.
Update: Embedding of original clip has been disabled, so now we have an alternate.
Update January 2017 fixed formatting, added caption, removed dead link to lala.com.