premise: With a large and circumspect 20 th Century technique , he wove the materials of national heroes and events , national <mask> and children 's fairy tales - Slavic dances and love songs - into a solid musical literature which served his people well , and is providing much enjoyment to the World at large .
hypothesis: the proper context for <mask> here should be the unwritten lore (stories and proverbs and riddles and songs) of a culture