Wiktionary
through-composed
a. (context music English) Of a song, composed so that each stanza may have different music, rather than the same being repeated for all of them. alt. (context music English) Of a song, composed so that each stanza may have different music, rather than the same being repeated for all of them.
Wikipedia
Through-composed
Through-composed means either music that is completely non-repetitive, music that is not interrupted by dialogue, or music that is composed in linear order.