Sing is related to Sign. you are likely to find Sign in/at/on City. City is related to Traffic. 
you are likely to find Musician in/at/on Tour. Tour is related to Motor. Motor is related to Gas. Gas is related to Engine. 
Sing <--RelatedTo--> Sign --AtLocation--> City <--RelatedTo--> Traffic 
Musician --AtLocation--> Tour <--RelatedTo--> Motor <--RelatedTo--> Gas <--RelatedTo--> Engine 