Is a particular type of imitation. It’s like a round, where the imitating part repeats the entire melody and not just a few motes of it.
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Card 37
Front
Stereo effect as a musical phrase is passed from one group of performers to another. E.g. like two choirs singing alternate phrases standing in different places in a church. Early religious vocal music was antiphonal
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Card 38
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A phrase is repeated (imitated – so not necessarily exactly the same!). Could be one instrument/voice imitating itself, or 2 or more imitating each other.