Rhythm is related to Song. Song is related to Sing. Sing is related to Dance. 
Trouble is a synonym of While. While is related to Dream. Freedom is a type of Dream. Freedom is related to Allow. 
Rhythm <--RelatedTo--> Song <--RelatedTo--> Sing <--RelatedTo--> Dance 
Trouble <--Synonym--> While <--RelatedTo--> Dream <--IsA-- Freedom <--RelatedTo--> Allow 