Single is related to Sound. Sound is related to Radio. Radio can be used for Communication. Contact is a type of Communication. 
Melt is a synonym of Disappear. Go is a type of Disappear. 
Single <--RelatedTo--> Sound <--RelatedTo--> Radio --UsedFor--> Communication <--IsA-- Contact 
Melt <--Synonym--> Disappear <--IsA-- Go 