Falsettos is a sung-through musical with a book by William Finn and James Lapine, and music and lyrics by Finn. The musical consists of March of the Falsettos (1981) and Falsettoland (1990), the last two installments in a trio of one-act musicals that premiered off-Broadway (the first was In Trousers). The story centers on Marvin, who has left his wife to be with a male lover, Whizzer, and struggles to keep his family together. Much of the first act explores the impact his relationship with Whizzer has had on his family. The second act explores family dynamics that evolve as he and his wife plan his son's bar mitzvah. Central to the musical are the themes of Jewish identity, gender roles, and gay life in the late 1970s and early 1980s. It also deals with the topic of the AIDS epidemic.

Falsettos premiered on Broadway in 1992 and was nominated for seven Tony Awards, winning those for Best Book and Best Original Score. The musical was revived on Broadway in 2016 starring Christian Borle and Andrew Rannells. The 2016 revival was filmed and adapted for the PBS Live from Lincoln Center television series, and aired on October 27, 2017. The revival was nominated for five Tony Awards, including Best Revival of a Musical. Both the original cast and 2016 revival cast performed at the Tony Awards. Other revivals include tours in Australia and the United Kingdom. The musical was praised by critics for its melodic compositions, humor, character development, and positive portrayal of non-traditional family structures.