dkh, the noun "band" can definitely appear in singular. Just think of phrases like "the band is playing" and "the band comes from etc".
Sure, when you refer back to it, you can substitute the pronoun "it" for the plural "they", but that doesn't imply that "band" as a noun is treated as a plural.
The difference between "band" and "police" is that police is uncountable, or a non-count noun, meaning you can't say "two polices".
Sure, when you refer back to it, you can substitute the pronoun "it" for the plural "they", but that doesn't imply that "band" as a noun is treated as a plural.
The difference between "band" and "police" is that police is uncountable, or a non-count noun, meaning you can't say "two polices".