In 1998, a momentous tour of the RSC adaptation of the MGM version of The Wizard of Oz was mounted, featuring two show biz luminaries.
Producer Robert Sher filled his cast with the best available performers of the day, including Jessica Grove as Dorothy, Lara Teeter as the Scarecrow, Dirk Lumbard as the Tin Woodman, Bob Dorian as Uncle Henry and the Winkie General, and Judith McCauley as Glinda (and presumably Aunt Em as well). The Cowardly Lion was played by Ken Page, who was no stranger to the character, having played him in a production of The Wiz! (Indeed, he seems to have an affinity for dressing as a huge, hairy feline, having also played Old Deuteronomy in the original Broadway production of Cats.)
But the main draws were legendary songstress and onetime Catwoman (on the Batman T.V. series) Eartha Kitt as Miss Gulch and the Wicked Witch of the West, and Judy Garland's good friend and frequent co-star Mickey Rooney as Professor Marvel and the Wizard.
Now, of course neither Miss Gulch nor the Wicked Witch sang in the movie, but it would be sheer idiocy to cast Miss Kitt in a non-singing role, correct? Therefore, "The Jitterbug" was re-crafted to the extent of having the Witch sing the first part of the song as a sort of incantation-- even incorporating her famous growl!-- following which the other characters took it up as the bugs affected them.
As for Mickey Rooney, while it is reported that he frequently had difficulty with his lines, he nevertheless delighted the crowd, especially those who remembered his many film appearances with MGM's Dorothy. And to be sure, this was the second time he had played an Oz character, the first being the Filmation animated movie Journey Back to Oz (loosely based on The Marvelous Land of Oz), in which he voiced the role of the Scarecrow and worked alongside Judy's daughter Liza Minnelli, who was Dorothy's voice.
Though Miss Kitt is now gone, her performance can still be enjoyed on the CD soundtrack of the musical, along with those of all the other participants. You humble History of Oz Examiner certainly regrets missing this one when it came to town, but it's good that the sounds remain.