Sentence:  With a large and circumspect 20 th Century technique , he wove the materials of national heroes and events , national folklore and children 's fairy tales - <WSD>Slavic</WSD> dances and love songs - into a solid musical literature which served his people well , and is providing much enjoyment to the World at large . 
Meaning of the word marked with <WSD> tags:  a branch of the Indo-European family of languages