About: http://webisa.webdatacommons.org/298583057

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	Opera singers are a good example of the physiological demands endured in a vocal performance where quality musical sound must be projected to every seat in an auditorium without assistance of electronic amplification.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com