What is "falsettos"

Falsetto \Fal*set"to\, n.; pl. Falsettos. [It. falsetto, dim. fr. L. falsus. See False.] A false or artificial voice; that voice in a man which lies above his natural voice; the male counter tenor or alto voice. See Head voice, under Voice.

n. (plural of falsetto English)

Falsettos is a musical with a book by James Lapine and William Finn and music and lyrics by Finn. The musical consists of March of the Falsettos and Falsettoland, the last two installments in a trio of one-act Off-Broadway musicals (the first was In Trousers). The story involves Marvin, his ex-wife Trina, his psychiatrist Mendel, his son Jason, and his gay lover Whizzer Brown. The musical premiered on Broadway in 1992.