falsettia
Falsettia is a term used in vocal pedagogy and singing to describe a specific vocal quality that can occur during the transition between the chest voice and the head voice. It is often characterized by a lighter, sometimes breathy or airy tone, and can be perceived as a less powerful or less resonant sound than either the chest or head voice produced independently.
The falsetto register is typically accessed by men and some women, though its exact mechanism and perception
The presence of falsettia is not necessarily an indication of poor singing technique. It is a natural