"A rock opera is a collection of rock music songs with lyrics that relate to a common story. Rock operas are typically released as concept albums ...
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and are not scripted for acting, which distinguishes them from operas, although several have been adapted as rock musicals. The use of various character roles within the song lyrics is a common storytelling device. The success of the rock opera genre has inspired similar works in other musical styles, such as rap opera." - (en.wikipedia.org 27.09.2020)
