Song is the opposite of Trouble. Trouble is related to Danger. Dangerous is derived from Danger. Dangerous is related to Risk. 
you are likely to find Photographer in/at/on Wedding. you are likely to find Band in/at/on Wedding. Departure is a type of Band. 
Song <--Antonym--> Trouble <--RelatedTo--> Danger <--DerivedFrom-- Dangerous <--RelatedTo--> Risk 
Photographer --AtLocation--> Wedding <--AtLocation-- Band <--IsA-- Departure 