Through-composed music

In music theory of musical form, through-composed music is relatively continuous, non-sectional, or non-repetitive music.
A song is said to be through-composed if it has different music for each stanza of the lyrics. This is in contrast to strophic form, in which each stanza is set to the same music. Sometimes the German "durchkomponiert" is used to indicate the same concept.
Definition.
Musicologist James Webster defines through-composed music in the following manner:
Many examples of this form can be found in Schubert's "Lieder", where the words of a poem are set to music and each line is different, for example, in his Lied "Erlkönig", in which the setting proceeds to a different musical arrangement for each new stanza and whenever the piece comes to each character, the character portrays its own voice register and tonality. Another example is Haydn's 'Farewell Symphony'.
No section of Ary Barroso's 1939 samba "Brazil" repeats; however, a second set of lyrics in English allows the melody to be sung through twice.
Opera and musicals.
The term "through-composed" is also applied to opera and musical theater to indicate a work that consists of an uninterrupted stream of music from beginning to end, as in the operas of Monteverdi and Wagner, as opposed to having a collection of songs interrupted by recitative or spoken dialogue, as occurs in Mozart's Italian- and German-language operas, respectively. Examples of the modern trend towards through-composed works in musical theater include the works of Andrew Lloyd Webber and Claude-Michel Schönberg. In musical theater, works with no spoken dialogue, such as "Les Misérables" or "Hamilton", are usually referred to by the term "through-sung".