... you can learn from:
All That Jazz (1979)
Angelique: Do you believe in love?
Joe: I believe in saying, "I love you."
It helps you concentrate.
A happy 40 to one of the musicals I actually unabashedly adore -- if you've been here at MNPP long enough you know I'm not especially a Musical Person, but if they're interesting subversions (read: dark) of the genre tropes I usually find grating (read: sunny) then I tend to be more open, more willing, and All That Jazz is a fantasia of death and drug abuse that's impossible to look away from.
I'd be curious to re-watch it now in this post Fosse/Verdon world we live in; Bob Fosse wasn't exactly insincere with regards to his faults but that show laid them out in ways he never would've been entirely able to. Plus you know Michelle Williams goes and gives one of the great performances of the decade in it...