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NONEt
a quintet
An octet.
A group of six singers or six instrumentalists.
mariachi's
mariachi's
There is no standard collective nouns for 'instrumentalists', however, the collective noun for musicians will work:a band of instrumentalistsan orchestra of instrumentalists
A pride.
A large group of locusts is called a "swarm".
pee
a plague of locust
A large number of people together is called a crowd or a group.