Falsetto

Singers know the difference between chest, head, and falsetto. Marilyn Horne once said that when a tenor runs out of room in his head voice, he can switch to falsetto for higher notes (of course he will get pilloried for it), but sopranos are already in falsetto at their top. The only men who regularly sing in falsetto are countertenors.I have no idea why some people call a head voice "falsetto". The two kinds of voice are placed and supported entirely differently.Traditionally, men have mixed head and chest voice as they approach the break point more liberally than women.