one thing you do when you Fish is Catch. Catch is a type of Understand. Interpret is a type of Understand. 
Rest is a synonym of Relax. Music can be used for Relax. Music is related to Tone. 
Fish --HasSubevent--> Catch --IsA--> Understand <--IsA-- Interpret 
Rest <--Synonym--> Relax <--UsedFor-- Music <--RelatedTo--> Tone 