The horror genre is able to be paired up with a wide variety of other film genres to create a movie that is more welcoming to a wider audience. Comedy and science fiction have proven to be quite compatible with horror, but another genre that has found success using horror elements is musicals. Broadway adaptations like Sweeney Todd: The Demon Barber of Fleet Street and Little Shop of Horrors along with other original horror movie musicals like Phantom of the Paradise have made their sinister stories told through songs accessible, and there are a few underrated movies that both horror and musical fans should add to their lists.
Source：https://www.cbr.com/horror-musicals-underrated/
