Answer:
knowledge of laws and regulations
Explanation:
Aperture is controlled by 'diaphragm' in optics.
If the musicians are highly skilled then it allows the stranger to come up with a more complex piece, but if they aren’t, then the arranger has to come up with something more simple. the talent directly correlates with the difficulty of the piece :)
Do Re Mi Re Mi Fa | Sol La | Sol Fa Mi Fa Sol | La Ti Do Ti | La Sol Fa Sol Fa | Mi Fa Mi Re | Mi Fa Mi Re | Do
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