Event is related to Performance. Performance is related to Art. Art is related to Artist. Singer is a type of Artist. 
Scale is related to Average. Average is related to Range. Range is a type of Constitute. 
Event <--RelatedTo--> Performance <--RelatedTo--> Art <--RelatedTo--> Artist <--IsA-- Singer 
Scale <--RelatedTo--> Average <--RelatedTo--> Range --IsA--> Constitute 