TRISTAN: Well, well, the gang’s all here.
Tristan references the popular song, Hail, Hail, The Gang’s All Here, written by Theodora Morse under the name D.A. Esrom, to a tune by Arthur Sullivan for the 1879 comic opera, The Pirates of Penzance. Although published in 1917, it had been referenced in American newspapers as a popular song since 1898, often sung at political gatherings and sporting matches.
The Annotated Gilmore Girls 