18.104.22.168 Two works intertwined
When two separate works are intertwined in a single publication, use judgment to determine whether one work is subsidiary to another, or the two works are conjoined in one. For example, when music and words have had independent existence as publications, treat the work as a compound work containing two works. Make separate records for each of the two works, or, optionally, create a record for one with the other work given a "work contained" added entry. When the words have existed for a long time, and the music is composed on just one occasion, treat the music as subsidiary to the words, creating a work identifier for the words consisting of name of author of words and title of words, and describing the presence of music as expression change. When the music has existed for a long time, and the words are written on just one occasion, treat the words as subsidiary to the music, creating a work identifier for the music consisting of name of composer of music and title of music, and describing the presence of words as expression change. For another example, consider the writer of a text with illustrations to be the principal author, but consider the artist to be the principal author of a pictorial work with commentary.