About: http://webisa.webdatacommons.org/367041438

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	do not forget, girls develop faster than boys, and so a boy should not be pushing his voice before it cracks... so for boys 14 or 15 years old is the best time to start training a voice.
http://www.w3.org/ns/prov#wasQuotedFrom	hellenism.net