In S1E18, Lorelai tells Sookie that her grandmother has offered to give Rory her trust fund early to pay for Chilton, but Rory doesn’t know yet. Sookie suggests, “Page her and have her call my cellphone and we can sing the money song from ‘Cabaret.’ You can be Liza, I’ll be Joel.”
Cabaret is a musical that opened on Broadway in 1966. Sookie is talking about the 1972 film adaptation though, starring Liza Minelli and Joel Grey. Minelli’s character is a singer at the Kit Kat Klub in pre-World War II Berlin, and Grey is the Master of Ceremonies at the same club. “Money Money” is the song Sookie mentions.