They are both singers
Bill DeLoach Bill DeLoach (born June 19, 1951 in Baltimore, Maryland), is a singer, keyboardist, guitarist, composer, vocal arranger, musical director, and music producer, who was a member of The Four Seasons and the musical director for entertainer Danny Gans.
Treble voice A treble voice is a voice which takes the treble part. In the absence of a separate descant part, this is normally the highest-pitched part, and otherwise the second highest. The term is most often used today within the context of choral music in reference to youthful singers. The American Choral Directors Association defines a treble as "a singer, both male and female, ages eight to sixteen".