Researchers in Sweden monitored the heart rates of singers as they performed a variety of choral works.
They found that as the members sang in unison, their pulses began to speed up and slow down at the same rate.
The scientists studied 15 choir members as they performed different types of songs.
They found that the more structured the work, the more the singers' heart rates increased or decreased together.
Slow chants, for example, produced the most synchrony.
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