Title: Musical theatre
Content:  later in the show, although it sometimes consists of a series of songs not directly musically related. Spoken dialogue is generally interspersed between musical numbers, although "sung dialogue" or recitative may be used, especially in so-called "sung-through" musicals such as Jesus Christ Superstar, Falsettos, Les Misérables, Evita and Hamilton. Several shorter musicals on Broadway and in the West End have been presented in one act in recent decades. Moments of greatest dramatic intensity in a book musical are often performed in song. Proverbially, "when the emotion becomes too strong for speech, you sing; when it becomes too strong for song, you dance." In a book musical, a song is ideally crafted to 
Title: Musical theatre
Content:  Since the 20th century, the "book musical" has been defined as a musical play where songs and dances are fully integrated into a well-made story with serious dramatic goals that is able to evoke genuine emotions other than laughter. The three main components of a book musical are its music, lyrics and book. The book or script of a musical refers to the story, character development and dramatic structure, including the spoken dialogue and stage directions, but it can also refer to the dialogue and lyrics together, which are sometimes referred to as the libretto (Italian for "little book"). The music and lyrics together form the score of a musical and include songs, 
Title: Musical theatre
Content:  Musical theatre is closely related to the theatrical form of opera, but the two are usually distinguished by weighing a number of factors. First, musicals generally have a greater focus on spoken dialogue. Some musicals, however, are entirely accompanied and sung-through, while some operas, such as Die Zauberflöte, and most operettas, have some unaccompanied dialogue. Second, musicals usually include more dancing as an essential part of the storytelling, particularly by the principal performers as well as the chorus. Third, musicals often use various genres of popular music or at least popular singing and musical styles. Finally, musicals usually avoid certain operatic conventions. In 
Title: Book writer
Content:  The book writer is the member of a musical's writing team who creates the book—the musical's plot, character development, and dramatic structure. Essentially, the book writer is the playwright of the musical, working very closely in collaboration with the lyricist and composer to create an integrated piece of drama. There is a common misconception that the book writer merely writes the dialogue; though the book does include the musical's spoken text, it is much more than that, defining and organizing the dramatic action of the entire piece, including action that is musicalized by the songwriter(s). Even "sung-through," "operatic," or "through-composed" musicals, where there is little, if any, spoken text, require as much contribution from a book writer as do musicals with extensive dialogue scenes. The book writer is often also the musical's lyricist, composer, or director.
Title: Musical theatre
Content:  to develop drama in a musical than in a straight play of equivalent length, since a musical usually devotes more time to music than to dialogue. Within the compressed nature of a musical, the writers must develop the characters and the plot. The material presented in a musical may be original, or it may be adapted from novels (Wicked and Man of La Mancha), plays (Hello, Dolly! and Carousel), classic legends (Camelot), historical events (Evita) or films (The Producers and Billy Elliot). On the other hand, many successful musical theatre works have been adapted for musical films, such as West Side Story, My Fair Lady, The Sound of Music, Oliver! and Chicago.
Title: Libretto
Content:  The opera libretto from its inception (ca. 1600) was written in verse, and this continued well into the 19th century, although genres of musical theatre with spoken dialogue have typically alternated verse in the musical numbers with spoken prose. Since the late 19th century some opera composers have written music to prose or free verse libretti. Much of the recitatives of George Gershwin's opera Porgy and Bess, for instance, are merely DuBose and Dorothy Heyward's play Porgy set to music as written – in prose – with the lyrics of the arias, duets, trios and choruses written in verse. The libretto of a musical, on the other hand, is almost always written in prose (except for the song lyrics). The libretto of a musical, if the musical is adapted from a play (or 
Title: Musical theatre
Content:  music and musical scenes, which are "theatrical sequence[s] set to music, often combining song with spoken dialogue." The interpretation of a musical is the responsibility of its creative team, which includes a director, a musical director, usually a choreographer and sometimes an orchestrator. A musical's production is also creatively characterized by technical aspects, such as set design, costumes, stage properties (props), lighting and sound. The creative team, designs and interpretations generally change from the original production to succeeding productions. Some production elements, however, may be retained from the original production, for example, Bob Fosse's choreography in Chicago. There is no fixed length for a musical. While it can range from a short one-act 
Title: Diegetic music
Content:  In musical theatre, as in film, the term "diegesis" refers to the context of a musical number in a work's theatrical narrative. In typical operas or operettas, musical numbers are non-diegetic; characters are not singing in a manner that they would do in a naturalistic setting; in a sense, they are not "aware" that they are in a musical. In contrast, when a song occurs literally in the plot, the number is considered diegetic. Diegetic numbers are often present in backstage musicals. For example, in The Sound of Music, the song "Edelweiss" is diegetic, since the character (Captain von Trapp) is performing the piece 
Title: Musical theatre
Content:  to several acts and several hours in length (or even a multi-evening presentation), most musicals range from one and a half to three hours. Musicals are usually presented in two acts, with one short intermission, and the first act is frequently longer than the second. The first act generally introduces nearly all of the characters and most of the music and often ends with the introduction of a dramatic conflict or plot complication while the second act may introduce a few new songs but usually contains reprises of important musical themes and resolves the conflict or complication. A book musical is usually built around four to six main theme tunes that are 
Title: Libretto
Content:  Libretti have been made available in several formats, some more nearly complete than others. The text – i.e., the spoken dialogue, song lyrics and stage directions, as applicable – is commonly published separately from the music (such a booklet is usually included with sound recordings of most operas). Sometimes (particularly for operas in the public domain) this format is supplemented with melodic excerpts of musical notation for important numbers. Printed scores for operas naturally contain the entire libretto, although there can exist significant differences between the score and the separately printed text. More often than not, this involves the extra repetition of words 

Question: what is the written dialogue portion of a musical called?
Answer: script.
libretto.