How to sing a piece written in quavers? (7)

I believe the answer is:

tremolo

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'piece written in quavers?' is the definition.
The definition and answer can be both related to natural events as well as being singular nouns.
Maybe you can see a link between them that I don't see?

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(Other definitions for tremolo that I've seen before include "Musical shake" , "effect of repeated bowing" , "Vibrating musical effect" , "Unsteady effect" , "Shaky effect in music" .)

I've seen this clue in The Globe and Mail.

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