"Fiorello!" is a musical that premiered on Broadway in 1959, created by Harold Prince and featuring music by Jerry Bock and lyrics by Sheldon Harnick. The show is based on the life of Fiorello LaGuardia, the charismatic mayor of New York City during the 1930s. It explores his rise to power, his dedication to public service, and his efforts to combat corruption. The musical is known for its lively score and engaging storytelling, blending humor with poignant moments. It won several awards, including the Tony Award for Best Musical, and remains a celebrated piece of American theater history.