"song" is used here as an uncountable noun. g. "break into song"), "song and dance", etc.
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NL888 Can book be an uncountable noun?No, not so far as I can think. (Quite a few countable nouns can be used in what seems to be an uncountable way in certain set phrases or idioms. It is possible that examples exist for "book". However, apparently uncountable use in one or two very idiomatic and restrictive patterns doesn't really justify the claim that a no