Finn is especially noted for his work on what was to become a trilogy of short musicals Off-Broadway. "In Trousers", "March of the Falsettos", and "Falsettoland" all chronicle the lives of the character Marvin, his ex-wife Trina, his boyfriend, Whizzer, his psychiatrist, Mendel, and his son, Jason. "Falsettos", the combination of the latter two parts of his Marvin Trilogy ("March of the Falsettos" and "Falsettoland"), opened on Broadway at the John Golden Theater on April 29, 1992, and ran for 486 performances. It went on to garner seven nominations at the 46th Tony Awards, winning two: the 1992 Tony Award for Best Original Score as well as the 1992 Tony Award for Best Book of a Musical, the latter shared with James Lapine.