Part is a type of Tune. Tune is related to Musician. Musician is related to Artist. Photographer is a type of Artist. 
Best is related to Choose. Choose is a synonym of Opt. 
Part --IsA--> Tune <--RelatedTo--> Musician <--RelatedTo--> Artist <--IsA-- Photographer 
Best <--RelatedTo--> Choose <--Synonym--> Opt 