About: http://webisa.webdatacommons.org/415020234

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	I am not sure what effects the 50Hz might produce - I think its the current (?) used by household electricity systems that can sometimes be a problem (what sort of problem I have no idea).
http://www.w3.org/ns/prov#wasQuotedFrom	guitarforbeginners.com