William Finn is an American composer and lyricist known for his contributions to musical theatre, particularly in the realm of contemporary musical styles. His work often blends elements of pop, jazz, and traditional musical theatre, characterized by intricate melodies and poignant lyrics. Finn gained prominence with his musicals, particularly "Falsettos," which began as a one-act show titled "March of the Falsettos" in 1981, later expanded into "Falsettoland" and combined into a two-act musical in 1992. This groundbreaking work explores themes of love, family, and the HIV/AIDS crisis, earning him Tony Awards for Best Book and Best Score. Another notable work is "A New Brain," which reflects Finn's personal experiences with health challenges and showcases his unique storytelling through music. His other significant contributions include "In Trousers" and "Make Me a Song," which further solidified his reputation in the musical theatre community. Finn's impact on music is evident in his ability to address complex emotional themes with humor and sincerity, influencing a generation of composers and contributing to the evolution of narrative-driven musicals. His work has earned him a dedicated following and critical acclaim, making him a significant figure in contemporary musical theatre.