Bebe played Velma Kelly and not Roxie Hart, who this story focuses on, both onstage and film, and the revival cast recording is available already. The great bit about Liza is that her peformance in Chicago was it wasn't advertised and there were no recordings made from it, except for this...
Great review, Dave! :D Once I read the list of the extra features, I knew I had to double-dip on this one, most especially to see the clips of Liza as well as the extended musical sequences. "Chicago" is a brilliant piece of musical theatre and the film was a wonderful adaptation of it...