Vocal theory
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The term "register" refers to a range of pitch having consistent timbre. In singing the concept of register is concerned mainly with a change in voice quality at particular pitches, due to changes in the interdependent cricothyroid, lateral cricoarytenoids and vocalis muscles of the larynx. [Callaghan, 1996]
[edit] Passaggio
The term "primo passaggio" refers to the first break in the voice when moving from lower chest voice to head voice. Some theorists say that the term "primo passaggio" is only applied to women and for men the term is "secondo passaggio" the passaggio seems to reflect breaking into or out of the chest voice.