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The top of the category page states: Musical compositions published or first performed in the year 1913. I assume the criteria is the year the composition premiered, partly because it would be vague, inexact and unfeasible to source, in every case, the years in which all such pieces were written. It's similar to how films are categorized by year of their release, not by the years of their filming, production, conception, etc. --DB1729talk01:57, 4 January 2023 (UTC)[reply]