Feature pieces are pieces which stand apart from the fabric of the performance in some way, often contributing traditional musical structures and thematic writing to provide some variation to the musical score. When suites or albums are made of theatrical scores (Peer Gynt, A Midsummer Night’s Dream) they are usually drawn from the feature pieces, as they are the cues that translate best into concert form.
Works outside the Narrative
These are pieces which the characters cannot hear. They are used to introduce or contextualse scenes for the audience, and to fill up time between scenes or acts. Aside from the most common types, Overtures and Intermezzos, these feature pieces can include Entr’actes, Curtain Call music, Exit music, interval music, preshow playlist and many other genres.
An intermezzo is an piece of music played between scenes or acts. Designed for a practical purpose—to cover a gap while the stage is dark and the set and costumes are changed—it usually also evokes the following scene, or provides a musical reflection on the scene before it.
Works within the narrative
These include songs, fanfares, dances, montages (although these are closer to underscore), ballets, background radio, jukebox, characters that perform, and other musical works that the characters can engage or interact with. Shakespeare makes great use of these and they provide many great moments in theatrical performances.
There are no great tricks to the composition of feature pieces for the theatre. Each composition is naturally governed by the requiremnts of the script and of the performance venue, but in general they allow composers to flex their creative muscles and present music that is distinctive or memorable, and emerge from the supporting foundation to which it is normally accustomed.