We can use 'a/an' and 'two, three, four', etc. with these (countable nouns): song, genre, person/people, instrument, musician, concert, CD, crowd, benefit, We can't use 'a/an' or 'two, three, four', etc. with these (uncountable): music, time, money, noise, equipment, information, sleep, applause , traffic,

Group sort, countable/uncountable

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