sentence: Some pieces are believed missing.
sentences_before: The original manuscript does not exist. Research depends upon the earliest printed copies.
sentences_after: Sometimes music Purcell composed in the middle 1680s is put into the score to balance the loss. Sometimes the missing music is composed completely afresh in Purcell's style.
concept_name: piece
headings: Dido and Aeneas Musical numbers
categories: 17th century operas