found: Work cat: Poulenc, Francis. Seven responses for Tenebrae, 1964:title page (Seven responses for Tenebrae : for soprano solo (child's voice), mixed chorus (children's and men's voices) and orchestra)
found: Hamilton, David. Escape at bedtime, 2011:title page (Escape at bedtime : 2-part treble voices and piano) caption (commissioned by Sydney Grammar School for the 2011 New Zealand tour)
found: Grove music online, October 7, 2019:Treble (a high voice, especially of a boy or (less commonly) girl; a high vocal or instrumental part... since the 18th century 'soprano' has gradually displaced 'treble' except in reference to children's voices and to certain older instruments such as the treble viol and the treble recorder)
found: Potter, Heather Williams. Perspectives on the American children's choir. 2005 :page 20 (the first ACDA Repertoire and Standards Committee for Children’s Choirs defined the genre as choirs of treble singers, both male and female, ages eight to sixteen)
