Its two major orchestral preludes occur in the beginnings of Acts II and II
Its two major orchestral preludes occur in the beginnings of Acts II and III and are respectively titled "Sunday Morning" and "Moonlight."  These are slightly different than "Dawn," the entr'acte that begins this opera's first act.  The title character's vocal performances include "Now the Great Bear and the Pleiades" and ""What harbor shelters peace," both of which are sung before his murder of an apprentice ruins hope of a rich life and a marriage to Ellen Orford.  The action takes place in The Borough, a village where the title fisherman dwells in, FTP, what opera by Benjamin Britten?
Its two major orchestral preludes occur in the beginnings of Acts II and III and are respectively titled "Sunday Morning" and "Moonlight."  
Peter Grimes