The term "head tone" refers to the quality of sound produced when a singer or speaker uses their head voice. It can also refer to the higher notes in a singer's range. Synonyms for "head tone" include head voice, falsetto, upper register, high notes, and soprano range. The term "head voice" specifically refers to the technique of singing notes with a lighter and brighter sound, using the higher and thinner vocal cords in the head. "Upper register" refers to the range of notes that are higher than the middle range of the voice. "Falsetto" is a technique where the singer makes a controlled break in their voice to produce higher notes.