In the moving final section of Act I, Chita sings and dances "Nowadays" from Chicago, alongside an empty spotlight representing her "killer diller" buddy, Gwen Verdon. Chita turns to that spotlight when she sings, "but nothing stays."
No one could ever replace Gwen, and Chita new that. It's really heartbreaking watching this number done with just one person. It's a true duet from beginning to end and just isn't the same without a partner.