The author’s main idea is that

a-jazz is america’s music

b-jazz should be taken seriously

c-duke ellington is an important america musician

d-america music has many faces

Highlight all instances of parallel structure. there is no longer any room for hope. if we wish to be free—if we mean to preserve inviolate those inestimable privileges for which we have been so long contending—if we mean not basely to abandon the noble struggle in which we have been so long engaged, and which we have pledged ourselves never to abandon until the glorious object of our contest shall be obtained—we must fight!