1) Answer 2) Antiphon 1) Antiphon 2) Call and response 3) For the real thing 4) Music 5) Responsive choir singing 
• (n.) A musical response; also, antiphonal chanting or signing. • (n.) An anthem or psalm sung alternately by a choir or congregation divided into two parts. Also figuratively.
An·tiph'o·ny noun ; plural Antiphonies [ See Antiphon .] 1. A musical response; also, antiphonal chanting or signing. 2. An anthem or psalm sung alternately by a choir or congregation divided into two parts. Also figuratively. « O! never more for me shall ...
[n] - alternate (responsive) singing by a choir in two parts
antiphony 1. A reference to antiphon. 2. Responsive chanting, recitation, or singing, e.g., of liturgical antiphons. 3. A musical response or answering phrase.
Phrases or motifs played alternately by two groups
noun alternate (responsive) singing by a choir in two parts
Music exploiting directional and canonic opposition of widely spaced choirs or groups of instruments to create perspectives in sound. It was developed in 17th-century Venice by Giovanni Gabrieli and in Germany by his pupil Heinrich Schütz and Roland de Lassus; an example is the double-choir motet Alma Redemptoris Mater
alternate or responsive singing by a choir in two divisions. · a psalm, verse, etc., so sung; antiphon. · a responsive musical utterance.