About: http://webisa.webdatacommons.org/429581035

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	With the advent of mass production and the growth of the middle class in the United States, musical instruments, including pianos, became a parlor or living room staple.
http://www.w3.org/ns/prov#wasQuotedFrom	wordpress.com