Megamusical
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A megamusical is a large-scale musical produced for large commercial profit. Such musicals utilize spectacle and increased technology to "radicalize the imagistic potential of musical theatre." Early concepts of the megamusical came into existence in the 1970s, and the form was established and popularized in the 1980s by individuals such as Andrew Lloyd Webber and Cameron Mackintosh. Megamusical is analogous to the film industry term "blockbuster".
The megamusical Starlight Express features spectacle elements as seen in this photo.
This is a photo from a touring production of Wicked, a megamusical from the early 2000s.
The chandelier in The Phantom of the Opera is featured in a moment of spectacle during the musical.
One of the qualities of a megamusical is having a large ensemble cast, as seen in Les Misérables.
Concept musical
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A concept musical is a work of musical theatre with a book and score structured to develop and embody a theme or message, rather than convey a narrative plot.
Cats cast, Roma Musical Theatre in Warsaw.