Song is related to Voice. Voice is related to Conscience. 
Leg can be used for Walking. Leg is related to Waist. Waist is related to Belly. Belly is a synonym of Gut. 
Song <--RelatedTo--> Voice <--RelatedTo--> Conscience 
Walking <--UsedFor-- Leg <--RelatedTo--> Waist <--RelatedTo--> Belly <--Synonym--> Gut 