Two accused murderess's vie for fame (and acquittal) in 1920's Chicago. This 2002 movie is based on the long-running musical, and has treatment that for the first time really exposes the story behind the music, although the music was there.
I was fortunate enough to see a traveling production of the play a few years ago, with now-deceased Robert Urich as the lawyer. I thoroughly enjoyed the play, but that didn't stop me from enjoying the movie.
I'm no big fan of musicals, but I highly recommend Chicago as excellent entertainment.