Music over opening titles

[The Spectre]

What is the bit of music that appears over the opening titles for "8-Ball Bunny", "Design for Leaving" and "Hare Do"? Does it have any words? I seem to remember Porky (and Daffy?) singing something to this tune in some short, but I can't remember which one.

[JDWeil]

I believe that's was Bug's own theme, What's Up Doc?.

[Jason Furness]

Nah, it's a song called "Don't Sweetheart Me".

Daffy sang some of it in "The Stupid Cupid". :daffy:

[Jave]

And Bugs sings it too in "Which is Witch"