From Natalie Curtis' observations, it can be inferred that the songs were performed by large groups of men, who would change them each time.
Conclusions that are made based on the logical examination of facts are called inferences.
The excerpt is related to the information from "Structure and Culture in "Twelfth Song of the Thunder".
In this text Natalie observes the Navajo people as they performed their songs.
Thus, it is correct to state that From Natalie Curtis' observations, it can be inferred that the songs were performed by large groups of men, who would change them each time.
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