The term 'high tenor' refers to a type of singing voice that is higher than the average male vocal range. Falsetto is an 8-letter word that describes a type of singing in which the singer produces tones in an upper register by using only the edges of the vocal cords. ALTO is a 4-letter word that describes a type of singing in which the singer produces tones in a lower register. High tenor is a combination of these two styles, allowing the singer to produce tones in both the upper and lower registers.