Pleasant is related to Aesthetic. Aesthetic is similar to Artistic. Artistic is related to Song. Song is related to Vocal. 
Depart is a synonym of Part. Part is related to Article. 
Pleasant <--RelatedTo--> Aesthetic <--SimilarTo--> Artistic <--RelatedTo--> Song <--RelatedTo--> Vocal 
Depart <--Synonym--> Part <--RelatedTo--> Article 