Assertion: folk music's origin | /r/HasProperty | traced
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Source sentences:
text: Though the origins of gangsta rap can be traced back to the mid-1980s style of Philadelphia's Schoolly D and the West Coast's Ice-T, the style broadened and came to apply to many different regions in the country, to rappers from New York, such as Notorious B.I.G. and influential hip hop group Wu-Tang Clan, and to rappers on the West Coast, such as Too Short and N.W.A.
text: The origin of Polish music can be traced as far back as the 13th century, from which manuscripts have been found in Stary Sącz, containing polyphonic compositions related to the Parisian Notre Dame School.