About: http://webisa.webdatacommons.org/433604870

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	From 1839, the Hutchinson Family Singers became well-known for their protest songs, especially songs supporting abolition.
http://www.w3.org/ns/prov#wasQuotedFrom	reference.com