交替圣歌（antiphon）：原来为咏唱诗篇的方式，诗篇每一节的上下两句分别由二个
唱诗班交替轮唱，后来这个交替的部分独立出去成为“交替圣歌”，它属于“纽姆式”圣咏。
antiphon,n.
A devotional composition sung responsively as part of a liturgy.
A short liturgical text chanted or sung responsively preceding or following a psalm, psalm verse, or canticle.
Such a text formerly used as a response but now rendered independently.
“It would be truer . . . to see [conservation] as an antiphon to the modernization of the 1950s and 1960s” (Raphael Samuel)